New Product
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Now at an introductory Price of $24.95
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NOTE: There will be a price increase on 1-1-09 to $34.95.
If you are interested or want more information
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Check out the Screenshots from our Automotive Performance Software.

Cylinder Head Flow Data at 28 Inches of Water

You can search this page by using your browser's EDIT —> FIND commands

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Peak Horse Power

These numbers have come from various magazines, web sites, manufactures catalogs, and ???
We have tried to verify the accuracy of these numbers but use at your own risk!

ALL Volume numbers are in CCs. — ALL Flow numbers are in CFM.

Bigger is not always better (The highest flow numbers and/or largest port volume). — Flow Velocity or the speed of the air through the port is just as important.
We want the best flow numbers with the smallest port volume and the highest velocity.
Remember to compare all flow numbers. — Low lift flow does help performance.
Just looking at flow numbers near or above maximum Valve lift for your camshaft is meaningless. Look for the best average flow from mid-lift to just before maximum lift of your camshaft.
For street engines airflow at 0.400-inch lift is a good place to evaluate flow.

Valve Size Column —
One reason numbers may vary is valve size, and / or Bore Fixture Size. — If I have the Bore Fixture Size it will be line 2 in the valve size column.
One reason exhaust numbers vary is if one person attached an Exhaust Tube/Pipe, if I have this information it will be line 3 in the valve size column. The increase from a pipe will vary from head to head but at higher lifts in normally in the 4 to 7 percent range.
Valve Lift Column —
Check the exhaust / intake flow ratio. If present this will be the second line in the cell.
Check the CFM per Square Inch of valve area calculations that are necessary when comparing the flow results of different size valves. The CFM flow per Square Inch of Intake valve area, if present this will be the third line in the cell and is PURPLE. The CFM flow per Square Inch of exhaust valve area, if present will follow. Note: these numbers are program generated and use 1 intake and 1 exhaust valve per cylinders it will generate bad data if the engine has more than one intake or exhaust valve cylinder. So divide the number shown by the number of valves.
Check the port velocity at the bowl area for the Intake port. If present this will be the 4th line in the cell and is RED. The port velocity of the exhaust, if present will follow. The bowl (CSA) Cross-Sectional Area is calculated using 90% of the valve diameter with nothing removed for valve stem area. Note: these numbers are program generated and use 1 intake and 1 exhaust valve per cylinders it will generate bad data if the engine has more than one intake or exhaust valve cylinder. So divide the number shown by the number of valves.
Check the Valve / Curtain Area Discharge Coefficient for the Intake port. If present this will be the 5th line in the cell and is MAGENTA. The Valve / Curtain Area Discharge Coefficient of the Exhaust, if present will follow. Note: these numbers are program generated and use 1 intake and 1 exhaust valve per cylinders it will generate bad data if the engine has more than one intake or exhaust valve cylinder. So divide the number shown by the number of valves.
We show a Maximum Horse Power number calculated using 3 different formulas. Line 1 uses one from AFR as show in a number of magazines that will call high performance street, line 2 uses a comp type formula and line 3 uses almost a Pro Stock type. Note: this number is program generated and uses 8 cylinders it will generate bad data if the engine is other than an 8 cylinder. Most engines have had an override added to make them come out correctly ex. Harley-Davidson. If you find a listing where I do not have an override or the override is wrong Please let me know.
Average Column —
When calculating the average number, flow at .100-inch lift is not used. This will be line 1.
When calculating the average exhaust / intake ratio there needs to be more than 2 flow numbers, and the number of intake and exhaust count must be equal. If present this will be line 2.
When calculating the CFM flow per cc of intake or exhaust port volume only the highest intake or exhaust flow number is used. If present this will be line 3.
Valve Lift at which the Bowl Area and Window / Curtain Area are the SAME SIZE. If present this will be line 4. The bowl (CSA) Cross-Sectional Area is calculated using 90% of the valve diameter with nothing removed for valve stem area.
How are heads that have a good and a bad port handled? -- The flow numbers for the 2 ports are averaged and this number is used in the calculations.
For a supercharged, or nitrous you will need a higher intake exhaust ratio.
Use these numbers only as a rough guide.
Remember when doing a comparison to other tables check at what pressure differential were they flowed?
There is a calculator on my Home Page to convert flow numbers from one pressure differential to another.

Where do MOST of the numbers come from?

Most flow numbers for AFR — Air Flow Research heads come from their Web Site or '05 Catalog, updated Dec. '05.
No flow numbers for ALL PRO Aluminum Cylinder Heads come from their Web Site, updated July '07.
Most flow numbers for BENNETT heads come from their Web Site updated May '07.
All flow numbers for BHPerformance Ported heads come from BHPerformance updated Jan. '05.
Most flow numbers for British Automotive - MGB heads come from their Web Site updated May '07 — and were converted from 10" to 28".
Most flow numbers for BRODIX heads come from their '98/'04/'06 Catalogs. Some from their Web Site updated March '08.
Most flow numbers for CANFIELD heads come from their Web Site updated March '08.
Most flow numbers for CCH Canadian Cylinder Head Technologies heads come from their Web Site updated Oct. '08.
Most flow numbers for CHI - Cylinder Head Innovations heads come from their Web Site updated March '08.
Most flow numbers for CHR Motorsports LLC heads were from CHR Motorsports or their Web Site updated May '07.
Most flow numbers for DART heads were from DART or their Web Site updated May '07.
All flow numbers for Darin Morgan heads come from Darin Morgin Web Site updated Nov '07.
All flow numbers for David Vizard / GoFastNews.com heads come from their Web Site updated April '08.
Most flow numbers for EDELBROCK heads come from their Web Site updated May '07.
All flow numbers for ET Performance heads come from their Web Site updated Nov. '06.
All flow numbers for FLO Headworks ported heads come from their Web Site. Updated June '07 — and were converted from 10" to 28".
Most flow numbers for Fox Lake ported heads come from their Web Site updated Feb. '07.
Most flow numbers for HRD ported heads come from their Web Site updated May. '07.
Most flow numbers for INDY heads come from their Web Site updated May '07.
All flow numbers for Kelford Cams heads come from Kelford Cams or their Web Site updated Oct. '08.
All flow numbers for KRE — Kauffman Racing Equipment ported heads were from them or come from their Web Site updated May '07.
Most flow numbers for Patriot Performance heads come from their Web Site updated Feb. '06.
Most flow numbers for M2 Race Systems heads come from their Web Site updated March '08.
All flow numbers for MBE LLC heads were from MBE LLC or their Web Site updated June '07.
All flow numbers for Meaux Racing heads were from Meaux Racing, their Web Site updated March '08.
All flow numbers for Reher Morrison Racing Engines heads come from their Web Site updated May '07.
All flow numbers for RHS — Racing Head Service heads come from their Web Site updated March '08.
All flow numbers for SD Performance heads come from their Web Site updated Nov '07.
All flow numbers for Shady Dell Speed Shop heads come from their Web Site updated June '07.
Most flow numbers for Shanons Engineering heads come from their Web Site updated May '07.
Most flow numbers for Sonny's Racing Engines, Inc. heads come from their Web Site updated May '07.
All flow numbers for Super Six Motorsports heads come from their Web Site updated June '07.
Most flow numbers for Total Engine Airflow — T.E.A. heads come from their Web Site updated Oct. '08.
Most flow numbers for Trick Flow heads come from their Catalog. Web Site updated May '07.
CCM - Means these numbers come from Car Craft Magazine Web Site.
CHP - Means these numbers come from Chevy High Performance Magazine Web Site.
HPMM - Means these numbers come from High Performance Mopar Magazine Web Site.
HPP - Means these numbers come from High Performance Pontiac Magazine Web Site.
MMM - Means these numbers come from Mopar Muscle Magazine Web Site.

Cylinder Head Flow Data Table

Manufacturer
Part Number

Port/Vol
Int/Exh

Valve Size Int/Exh

Combust. Chamber Volume

.100

.150

.200

.250

.300

.350

.400

.450

.500

.550

.600

Average

1.8l Type R

N/A

Stock

N/A

262/207
79.0%
-
269
292
329 hp

1.8l Type R Ported CCH

N/A

Stock

N/A

299/242
80.9%
-
308
334
375 hp

1.8l GSR

N/A

Stock

N/A

250/189
75.6%
-
257
279
314 hp

1.8l GSR Ported CCH

N/A

Stock

N/A

290/234
80.7%
-
298
324
364 hp

RSX Ported CHR Motorsports LLC

N/A

Stock

N/A

95/113
118%

131/148
113%

162/175
108%
-
167 hp

192/200
104%
-
197
214 hp

213/213
100%
-
219
238 hp

234/226
96.6%
-
241
261
294 hp

251/232
92.4%
-
258
280
315 hp

264/237
89.8%
-
272
295
331 hp

277/241
87.0%
-
285
309
348 hp

286/244
85.3%
-
294
319
359 hp

293/245
83.6%
-
301
327
368 hp

230/216
93.8%

Manufacturer
Part Number

Port/Vol
Int/Exh

Valve Size Int/Exh

Combust. Chamber Volume

.100

.200

.300

.400

.500

.600

.700

.800

Average

AMC 291 Iron

173/73

2.025/1.62

N/A

225/155
68.9%
69.9/75.2
207/223
.484/.417
463
502 hp

-
-
1.30/2.12
.410/.328

AMC SS Iron

N/A

2.08/1.66

N/A

264/-
77.7
230
.461
543
589
663 hp

-
-
-
.421/.336

AMC Iron Ported Payton

N/A

2.08/1.625

270/200
74.1%
79.5/96.4
235/286
.404/.383
555
603
678 hp

-
-
-
.421/.329

Edelbrock 60119, 60139 Alum

185/70

2.02/1.60

65/52
80.0%

130/96
73.8%

192/127
66.1%
59.9/63.2
178/187
.691/.577
395 hp

235/163
69.4%
73.3/81.1
217/240
.634/.555
483
525 hp

258/182
70.5%
80.5/90.5
239/268
.557/.496
531
576 hp

260/190
73.1%
81.1/94.5
240/280
.468/.431
535
580
653 hp

215/152
70.5%
1.41/2.71
.409/.324

Indy 401-SR Alum

235/105

2.10/1.65

136/123
90.4%

195/159
81.5%
56.3/74.4
167/220
.675/.700
401 hp

233/178
76.4%
67.3/83.2
199/247
.605/.588
479
520 hp

259/186
71.8%
74.8/87.0
222/258
.538/.492
533
578 hp

272/191
70.2%
78.5/89.3
233/265
.471/.421
560
607
683 hp

272/192
70.6%
78.5/89.8
233/266
.403/.362
560
607
683 hp

228/172
75.3%
1.16/1.83
.425/.334

Indy 401-SR Full Porting Alum

N/A

2.10/1.65

N/A

141/123
87.2%

204/155
76.0%
58.9/72.5
175/215
.706/.683
420 hp

253/181
71.5%
73.0/84.6
216/251
.657/.598
520
565 hp

287/207
72.1%
82.9/96.8
246/287
.596/.547
590
641 hp

311/225
72.3%
89.8/105
266/312
.538/.496
640
694
781 hp

322/237
73.6%
93.0/111
275/328
.478/.447
662
719
808 hp

253/188
74.3%
-
.425/.334

Indy 401-1 Alum

245/110

2.19/1.81

139/114
82.0%

195/147
75.4%
51.8/57.1
153/169
.647/.590
401 hp

241/172
71.4%
64.0/66.8
190/198
.600/.518
496
538 hp

272/189
69.5%
72.2/73.5
214/218
.542/.455
560
607 hp

288/197
68.4%
76.5/76.6
227/227
.478/.395
592
643
723 hp

288/205
71.2%
76.5/79.7
227/236
.410/.353
592
643
723 hp

237/171
72.0%
1.18/1.86
.443/.367

Indy 401-1 Full Porting Alum

275/125

2.19/1.81

N/A

147/120
81.6%

208/158
76.0%
55.2/61.4
164/182
.690/.634
428 hp

257/186
72.4%
68.2/72.3
202/214
.640/.560
529
574 hp

297/207
69.7%
78.8/80.4
234/238
.591/.499
611
663 hp

329/224
68.1%
87.3/87.1
259/258
.546/.450
677
734
826 hp

354/238
67.2%
94.0/92.5
278/274
.503/.410
728
790
888 hp

265/189
71.2%
1.29/1.90
.443/.367

Indy 401-1 CNC Alum

300/134

2.25/1.81

239/175
73.2%
60.1/68.0
178/202
.772/.703
492 hp

298/214
71.8%
74.9/83.2
222/246
.722/.644
613
665 hp

349/254
72.8%
87.8/98.7
260/292
.676/.612
718
779 hp

376/274
72.9%
94.6/106
280/316
.607/.550
773
839
944 hp

388/285
73.5%
97.6/111
289/328
.537/.490
798
866
974 hp

390/287
73.6%
98.1/112
291/330
.472/.432
802
870
979 hp

340/248
73.0%
1.30/2.14
.456/.367

Manufacturer
Part Number

Port/Vol
Int/Exh

Valve Size Int/Exh

Combust. Chamber Volume

.100

.150

.200

.250

.300

.350

.380

.400

.450

.500

.550

Average

1.8l T 20 V Small Port

N/A

Stock

N/A

177/171
96.6%
-
182
198
222 hp

1.8l T 20 V Small Port Ported CCH

N/A

Stock

N/A

238/202
84.9%
-
245
266
299 hp

1.8l T 20 V Large Port

N/A

Stock

N/A

212/195
92.0%
-
218
237
266 hp

1.8l T 20 V Large Port Ported CCH

N/A

Stock

N/A

257/224
87.2%
-
264
287
323 hp

Manufacturer
Part Number

Port/Vol
Int/Exh

Valve Size Int/Exh

Combust. Chamber Volume

.050

.100

.150

.200

.250

.300

.350

.400

.450

.500

Average

EVO 3

N/A

37mm/ 32mm

N/A

92/77
83.7%

185/165
89.2%
111/132
329/392
1.38/1.42
190
206 hp

248/213
85.9%
149/171
441/506
1.23/1.22
255
277
311 hp

264/225
85.2%
158/180
469/535
.988/.973
272
295
331 hp

268/228
85.1%
161/183
476/542
.891/.877
276
299
336 hp

273/231
84.6%
164/185
485/549
.817/.800
281
305
343 hp

222/190
85.6%
-
.295/.255

Mini Cooper S CHR Motorsports LLC

N/A

30.25mm/ 23.25mm

N/A

33/31
93.9%

66/51
77.3%

98/77
78.6%
88.0/117
261/347
1.19/1.22
100.8 hp

127/98
77.2%
114/149
338/441
1.16/1.16
130.6
141.7 hp

153/106
69.3%
137/161
407/477
1.12/1.01
157
171 hp

169/111
65.7%
152/169
450/500
1.03/.881
174
189
212 hp

174/113
64.9%
156/172
463/509
.910/.769
179
194
218 hp

176/115
65.3%
158/175
468/518
.805/.685
181
196
221 hp

175/116
66.3%
157/176
465/522
.712/.614
180
195
220 hp

142/98.4
69.2%
-
.241/.185

Mini Cooper S CHR Motorsports LLC

N/A

31.25mm/ 24.25mm

N/A

83/45
54.2%

136/107
78.7%
114/149
339/443
1.20/1.22
139.9
152 hp

160/120
75.0%
135/168
399/497
1.13/1.09
165
179 hp

179/127
70.9%
151/177
446/526
1.05/.967
184
200
225 hp

182/130
71.4%
153/182
454/538
.921/.848
187
203
228 hp

191/132
69.1%
161/184
476/546
.846/.754
196
213
240 hp

193/133
68.9%
162/186
481/550
.760/.675
199
215
242 hp

161/113
70.6%
-
.249/.193

Mini Cooper S Ported CHR Motorsports LLC

N/A

31.25mm/ 24.25mm

N/A

55/35
63.6%

111/69
62.2%

144/102
70.8%
121/142
359/422
1.70/1.55
148.1 hp

173/129
74.6%
146/180
431/534
1.53/1.47
178
193 hp

200/149
74.5%
168/208
498/617
1.41/1.36
206
223 hp

213/164
77.0%
179/229
531/679
1.25/1.24
219
238
267 hp

221/172
77.8%
186/240
551/712
1.11/1.12
227
247
277 hp

232/173
74.6%
195/242
578/716
1.02/.988
239
259
291 hp

236/174
73.7%
199/243
588/720
.929/.883
243
263
296 hp

191/142
74.0%
-
.249/.193

Mini Cooper S Ported CHR Motorsports LLC

N/A

31.25mm/ 24.5mm

N/A

55/42
76.4%

111/80
72.1%

144/123
85.4%
121/168
359/499
1.70/1.85
148.1 hp

173/151
87.3%
146/207
431/612
1.53/1.70
178
193 hp

200/161
80.5%
168/220
498/653
1.41/1.45
206
223 hp

213/165
77.5%
179/226
531/669
1.25/1.24
219
238
267 hp

221/170
76.9%
186/233
551/689
1.11/1.09
227
247
277 hp

232/172
74.1%
195/235
578/697
1.02/.972
239
259
291 hp

236/173
73.3%
199/237
588/701
.929/.869
243
263
296 hp

191/149
78.1%
-
.249/.195

Mini Cooper S Ported Madness Stage 1

N/A

38/37
97.4%

75/70
93.3%

109/107
98.2%
-
112.1 hp

143/134
93.7%
-
147.1
160 hp

175/142
81.1%
-
180
195 hp

198/144
72.7%
-
204
221
248 hp

211/145
68.7%
-
217
235
265 hp

217/145
66.8%
-
223
242
272 hp

161/127
78.6%

Mini Cooper S Ported Madness Stage 2

N/A

36/32
88.9%

73/61
83.6%

110/91
82.7%
-
113.1 hp

145/122
84.1%
-
149.1
162 hp

178/152
85.4%
-
183
199 hp

213/161
75.6%
-
219
238
267 hp

224/164
73.2%
-
230
250
281 hp

230/165
71.7%
-
237
257
289 hp

168/131
78.1%

Manufacturer
Part Number

Port/Vol
Int/Exh

Valve Size Int/Exh

Combust. Chamber Volume

.100

.200

.300

.400

.500

.600

.700

Average

Buick 215 V8 Alum

N/A

1.525/1.35

N/A

128/81
63.3%
70.1/56.6
208/168
.457/.327
263
286 hp

-
-
-
.309/.273

Buick 300 V8 Alum

N/A

1.625/1.312

N/A

105/96
91.4%

135/108
80.0%
65.1/79.9
193/237
.604/.598
278 hp

142/115
81.0%
68.5/85.1
203/252
.476/.478
292
317 hp

149/115
77.2%
71.8/85.1
213/252
.400/.382
307
333 hp

154/116
75.3%
74.3/85.8
220/254
.344/.321
317
344
387 hp

137/110
80.3%
-
.329/.266

Buick Nailhead Stock Iron

N/A

1.875/1.437
4.00
No Pipe

124

63/41
65.1%

110/81
73.6%

146/101
69.2%
52.9/62.3
157/185
.566/.511
300 hp

183/107
58.5%
66.3/66.0
196/195
.532/.406
376
408 hp

188/111
59.0%
68.1/68.4
202/203
.437/.337
387
420 hp

157/100
63.8%
-
.380/.291

Buick Nailhead Ported Iron

N/A

1.875/1.437
4.00
No Pipe

124

60/47
78.3%

122/76
62.3%

169/99
58.6%
61.2/61.0
181/181
.655/.501
348 hp

196/111
56.6%
71.0/68.4
210/203
.570/.421
403
437 hp

196/116
59.2%
71.0/71.5
210/212
.456/.352
403
437 hp

171/101
58.9%
-
.380/.291

Buick GN

N/A

1.71/1.50

N/A

156/110
70.5%
67.9/62.2
201/184
.398/.320
241
261 hp

-
-
-
.346/.304

Buick GN

N/A

1.71/1.50

N/A

54/50
92.6%

111/96
86.5%

161/131
81.4%
70.1/74.1
208/220
.684/.635
248 hp

177/136
76.8%
77.1/77.0
228/228
.564/.494
273
296 hp

178/136
76.4%
77.5/77.0
230/228
.454/.395
275
298 hp

157/125
79.6%
-
.346/.304

Buick GN Ported

N/A

1.77/1.50

N/A

196/157
80.1%
79.7/88.8
236/263
.604/.570
302
328 hp

-
-
-
.358/.304

Buick GN1 Ported

N/A

1.77/1.50
3.875

N/A

62/51
82.3%

128/106
82.8%

182/139
76.4%
74.0/78.7
219/233
.747/.673
281 hp

216/164
75.9%
87.8/92.8
260/275
.665/.596
333
362 hp

228/172
75.4%
92.7/97.3
275/288
.562/.500
352
382 hp

228/177
77.6%
92.7/100
275/297
.468/.429
352
382
429 hp

196/152
77.2%
-
.358/.304

Buick TA Ported to Stage I Iron

N/A

2.13/1.75

N/A

66/57
86.4%

133/109
82.0%

188/133
70.7%
52.8/55.3
156/164
.641/.552
387 hp

226/147
65.0%
63.4/61.1
188/181
.578/.458
465
504 hp

236/159
67.4%
66.2/66.1
196/196
.483/.396
485
527 hp

234/159
67.9%
65.7/66.1
195/196
.399/.330
481
522
587 hp

233/162
69.5%
65.4/67.4
194/200
.341/.288
479
520
585 hp

208/145
69.5%
-
.431/.354

Buick Stage I Iron

N/A

2.13/1.75

N/A

230/189
82.2%
64.5/78.6
191/233
.392/.392
473
513
577 hp

-
-
-
.431/.354

Buick Stage I Ported Iron

N/A

295/205
69.5%
-
607
658
740 hp

Buick Stage II

N/A

2.13/1.75

N/A

236/213
90.3%
66.2/88.6
196/262
.403/.442
485
527
592 hp

-
-
-
.431/.354

Buick Stock 455 Iron

184/142

N/A

220/150
68.2%
-
453
491
552 hp

-
-
1.20/1.06

Buick 430 #985 Ported TA Iron

N/A

-
4.350

N/A

142/109
76.8%

202/155
76.7%
-
416 hp

250/176
70.4%
-
514
558 hp

287/199
69.3%
-
590
641 hp

300/204
68.0%
-
617
670
753 hp

236/169
71.4%

Bulldog Ported Earick Racing Alum

N/A

101/-

162/-

234/-

344/-
-
708
768 hp

349/-
-
718
779 hp

380/-
-
782
848
954 hp

294

Edelbrock 60049 Alum

215/130

2.125/1.75

68/58
85.3%

127/108
85.0%

190/150
78.9%
53.6/62.4
159/185
.650/.623
391 hp

241/173
71.8%
68.0/71.9
201/213
.618/.539
496
538 hp

274/183
66.8%
77.3/76.1
229/225
.562/.456
564
612 hp

273/190
69.6%
77.0/79.0
228/234
.467/.395
562
609
685 hp

221/161
72.8%
1.27/1.46
.430/.354

TA Performance ported 455 Iron

N/A

2.13/1.75

N/A

250/180
72.0%
70.2/74.8
208/222
.426/.374
514
558
627 hp

-
-
-
.431/.354

TA Performance
stage 1 Base Alum

N/A

2.13/1.755

N/A

280/200
71.4%
78.6/82.7
233/245
.478/.414
576
625
703 hp

-
-
-
.431/.355

TA Performance
stage 2 Alum

N/A

2.13/1.75

N/A

300/240
80.0%
84.2/99.8
249/296
.512/.498
617
670
753 hp

-
-
-
.431/.354

TA Performance
stage 3 Alum

N/A

2.25/1.80

N/A

330/255
77.3%
83.0/100
246/297
.533/.515
679
737
828 hp

-
-
-
.456/.365

TA Performance stage 3 Alum Ported Bruce Kent

N/A

2.225/1.80

N/A

330/255
77.3%
84.9/100
251/297
.539/.515
679
737
828 hp

385/295
76.6%
99.0/116
293/343
.539/.510
792
859
966 hp

358/275
76.9%
-
.451/.365

TA Performance
stage 4 Alum

N/A

2.25/1.80

N/A

375/265
70.7%
94.3/104
279/309
.606/.535
771
837
941 hp

-
-
-
.456/.365

Manufacturer
Part Number

Port/Vol
Int/Exh

Valve Size Int/Exh

Combust. Chamber Volume

.100

.200

.300

.400

.500

.600

.700

Average

Bulldog Performance Alum

260/-

2.19/1.84

65/61
93.8%

125/117
93.6%

178/159
89.3%
47.3/59.8
140/177
.591/.628
366 hp

238/203
85.3%
63.2/76.3
187/226
.592/.601
490
531 hp

285/219
76.8%
75.7/82.4
224/244
.567/.519
586
636 hp

307/235
76.5%
81.5/88.4
241/262
.509/.464
632
685
771 hp

302/242
80.1%
80.2/91.0
238/270
.429/.410
621
674
758 hp

239/196
81.9%
1.18
.443/.373

Bulldog Performance Ported CPP Alum

N/A

2.19/1.77

360/-
95.6
283
.512
741
803
904 hp

-
-
-
.443/.358

Manufacturer
Part Number

Port/Vol
Int/Exh

Valve Size Int/Exh

Combust. Chamber Volume

.100

.200

.300

.400

.500

.600

.700

.800

.900

1.000

Average

Chevy Bow Tie

171/-

2.02/1.60

N/A

212/145
68.4%
66.2/72.1
196/214
.458/.395
436
473 hp

211/147
69.7%
65.8/73.1
195/217
.380/.334
434
471
530 hp

212/146
69.0%
1.24
.409/.324

Chevy Bow Tie

178/-

N/A

221/138
62.4%
-
455
493
555 hp

-
-
1.24

Chevy Bow Tie #2

N/A

250/174
69.6%
-
514
558 hp

Chevy Bow Tie Phase II Iron CCM

184/55

63/57
90.5%

130/100
76.9%

177/119
67.2%
-
364 hp

205/123
60.0%
-
422
458 hp

225/123
54.7%
-
463
502 hp

210/127
60.5%
-
432
469
527 hp

209/127
60.8%
-
430
466
525 hp

193/120
62.2%
1.22/2.31

Chevy '186 Fuelie Iron

161/65

60/38
63.3%

113/76
67.3%

159/110
69.2%
-
327 hp

182/125
68.7%
-
374
406 hp

187/135
72.2%
-
385
417 hp

188/140
74.5%
-
387
420
472 hp

166/117
70.7%
1.17/2.15

Chevy '441 Iron CHP

155/62

1.94/1.50
-
No Pipe

55/45
81.8%

110/80
72.7%

160/112
70.0%
54.1/63.4
160/188
.599/.543
329 hp

194/127
65.5%
65.6/71.9
194/213
.545/.461
399
433 hp

201/136
67.7%
68.0/77.0
201/228
.452/.395
413
449 hp

203/139
68.5%
68.7/78.7
203/233
.380/.337
418
453
509 hp

174/119
68.4%
1.31/2.24
.393/.304

Chevy '441 Iron CHP

155/62

1.94/1.50
-
Pipe

55/45
81.8%

110/83
75.5%

160/118
73.8%
54.1/66.8
160/198
.599/.572
329 hp

194/133
68.6%
65.6/75.3
194/223
.545/.483
399
433 hp

201/146
72.6%
68.0/82.6
201/245
.452/.424
413
449 hp

203/148
72.9%
68.7/83.8
203/248
.380/.359
418
453
509 hp

174/126
72.4%
1.31/2.39
.393/.304

Chevy '461 Iron

161/63

2.02/1.60

216/137
63.4%
67.4/68.1
200/202
.466/.373
444
482 hp

-
-
1.34/2.17
.409/.324

Chevy '461 Ported Iron

N/A

2.02/1.60
4.06

N/A

94/65
69.1%

152/102
67.1%

183/126
68.9%
57.1/62.7
169/186
.658/.572
376 hp

210/147
70.0%
65.5/73.1
194/217
.567/.501
432
469 hp

224/162
72.3%
69.9/80.6
207/239
.484/.441
461
500 hp

232/172
74.1%
72.4/85.5
214/253
.417/.391
477
518
582 hp

238/180
75.6%
74.3/89.5
220/265
.367/.350
490
531
597 hp

207/148
71.8%
-
.409/.324

Chevy '461X Iron

172/62

Chevy '462 Iron CCM

157/64

1.94/1.50
-
No Pipe

50/54
108%

119/88
73.9%

167/116
69.5%
56.5/65.6
167/194
.626/.562
344 hp

198/128
64.6%
67.0/72.4
198/215
.556/.465
407
442 hp

212/134
63.2%
71.7/75.8
213/225
.476/.390
436
473 hp

218/137
62.8%
73.8/77.5
219/230
.408/.332
448
487
547 hp

183/121
66.0%
1.39/2.14
.393/.304

Chevy '462 Iron CCM

157/64

1.94/1.50
-
Pipe

50/54
108%

119/91
76.5%

167/121
72.5%
56.5/68.5
167/203
.626/.586
344 hp

198/134
67.7%
67.0/75.8
198/225
.556/.487
407
442 hp

212/139
65.6%
71.7/78.7
213/233
.476/.404
436
473 hp

218/142
65.1%
73.8/80.4
219/238
.408/.344
448
487
547 hp

183/125
68.6%
1.39/2.22
.393/.304

Chevy '492 Iron

157/62

2.02/1.60

173/125
72.3%
54.0/62.2
160/184
.622/.568
356 hp

198/137
69.2%
61.8/68.1
183/202
.534/.467
407
442 hp

206/141
68.4%
64.3/70.1
190/208
.445/.384
424
460 hp

209/141
67.5%
65.2/70.1
193/208
.376/.320
430
466
525 hp

197/136
69.2%
1.33/2.27
.409/.324

Chevy '882 Iron CCM

151/59

1.94/1.50
-
No Pipe

70/58
82.9%

125/108
86.4%

175/135
77.1%
59.2/76.4
175/226
.656/.654
360 hp

204/141
69.1%
69.0/79.8
204/236
.573/.512
420
455 hp

205/142
69.3%
69.4/80.4
205/238
.461/.413
422
458 hp

206/142
68.9%
69.7/80.4
206/238
.386/.344
424
460
517 hp

183/134
73.0%
1.36/2.41
.393/.304

Chevy '882 Iron CCM

151/59

1.94/1.50
-
Pipe

70/59
84.3%

125/109
87.2%

175/136
77.7%
59.2/77.0
175/228
.656/.659
360 hp

204/143
70.1%
69.0/80.9
204/240
.573/.520
420
455 hp

205/144
70.2%
69.4/81.5
205/241
.461/.419
422
458 hp

206/145
70.4%
69.7/82.1
206/243
.386/.351
424
460
517 hp

183/135
74.0%
1.36/2.46
.393/.304

Chevy LB4 Syclone

N/A

165/119
72.1%
-
339
368 hp

GM LS1 Alum

N/A

2.00/1.55
3.90

N/A

148/103
69.6%

200/152
76.0%
63.7/80.6
189/239
.727/.713
411 hp

216/167
77.3%
68.8/88.5
204/262
.589/.587
444
482 hp

225/181
80.4%
71.6/95.9
212/284
.491/.509
463
502 hp

238/190
79.8%
75.8/101
224/298
.432/.445
490
531
597 hp

205/159
77.2%
-
.405/.314

GM LS1 Alum

204/-

2.00/1.55

123/108
87.8%

180/147
81.7%
57.3/77.9
170/231
.654/.689
370 hp

219/172
78.5%
69.7/91.2
207/270
.597/.605
451
489 hp

231/193
83.5%
73.5/102
218/303
.504/.543
475
516 hp

188/155
82.3%
1.13
.405/.314

GM LS1 Alum CHP

204/-

2.00/1.55
-
Pipe

83/62
74.7%

134/104
77.6%

189/136
72.0%
60.2/72.1
178/214
.687/.638
389 hp

222/165
74.3%
70.7/87.4
209/259
.605/.580
457
495 hp

240/179
74.6%
76.4/94.9
226/281
.523/.504
494
536 hp

252/185
73.4%
80.2/98.0
238/290
.458/.434
518
562
632 hp

207/154
74.2%
1.24
.405/.314

GM LS1 Ported AP Engineering Alum

235/-

2.02/1.575
3.970
Pipe

N/A

73/54
74.0%

150/111
74.0%

207/155
74.9%
64.6/79.6
191/236
.745/.715
426 hp

252/195
77.4%
78.6/100
233/297
.680/.675
518
562 hp

285/221
77.5%
88.9/113
263/336
.615/.612
586
636 hp

292/231
79.1%
91.1/119
270/351
.525/.533
601
652
733 hp

301/237
78.7%
93.9/122
278/360
.464/.469
619
672
755 hp

248/192
77.3%
1.28
.409/.319

GM LS1 Ported ET Performance Alum

224/-

2.02/1.57
3.90

N/A

68/56
82.4%

143/112
78.3%

196/158
80.6%
61.2/81.6
181/242
.705/.731
403 hp

247/190
76.9%
77.1/98.1
228/291
.666/.660
508
551 hp

280/206
73.6%
87.4/106
259/315
.604/.572
576
625 hp

303/214
70.6%
94.5/111
280/328
.545/.495
623
676
760 hp

234/176
75.3%
1.35
.409/.318

Chevy 5.3L Ported Stage II ForceFed High Performance

N/A

2.02/1.57

N/A

67/62
92.5%

133/109
82.0%

194/148
76.3%
60.5/76.4
179/227
.698/.685
399 hp

242/184
76.0%
75.5/95.0
224/282
.653/.639
498
540 hp

274/205
74.8%
85.5/106
253/314
.591/.569
564
612 hp

296/220
74.3%
92.4/114
274/337
.532/.509
609
661
743 hp

228/173
76.0%
-
.409/.318

GM LS1 5.3 L Ported Total Engine Airflow Stage 1.5 Alum

N/A

2.02/1.57

N/A

67/54
80.6%

140/122
87.1%

203/172
84.7%
63.3/88.8
188/263
.730/.796
418 hp

251/218
86.9%
78.3/113
232/334
.677/.757
516
560 hp

289/244
84.4%
90.2/126
267/373
.624/.678
595
645 hp

314/260
82.8%
98.0/134
290/398
.565/.602
646
701
788 hp

239/203
84.9%
-
.409/.318

GM LS1 5.3 L Ported Total Engine Airflow Stage 2 Alum

N/A

2.02/1.57

N/A

67/57
85.1%

140/111
79.3%

208/169
81.3%
64.9/87.3
192/259
.748/.782
428 hp

252/213
84.5%
78.6/110
233/326
.680/.739
518
562 hp

290/241
83.1%
90.5/124
268/369
.626/.669
597
647 hp

317/255
80.4%
98.9/132
293/390
.570/.590
652
708
796 hp

241/198
81.9%
-
.409/.318

GM LS1 5.3 L Ported Total Engine Airflow Stage 3 Alum

N/A

67/55
82.1%

143/115
80.4%

211/157
74.4%
-
434 hp

257/201
78.2%
-
529
574 hp

299/256
85.6%
-
615
667 hp

326/276
84.7%
-
671
728
818 hp

247/201
81.3%

Manufacturer
Part Number

Port/Vol
Int/Exh

Valve Size Int/Exh

Combust. Chamber Volume

.100

.200

.300

.400

.500

.600

.700

.800

.900

1.000

Average

GM LM7 5.3 L Ported West Coast Stage 2 Alum

N/A

1.94/1.57

305/223
73.1%
103/115
306/341
.571/.516
627
681
766 hp

-
-
-
.393/.318

GM LM7 5.3 L Ported West Coast Stage 2 Alum

N/A

2.02/1.57

305/223
73.1%
95.2/115
282/341
.549/.516
627
681
766 hp

-
-
-
.409/.318

GM LS1 5.7 L Ported Patriot Performance Alum

N/A

2.02/1.57

N/A

67/61
91.0%

133/108
81.2%

194/147
75.8%
60.5/75.9
179/225
.698/.680
399 hp

242/183
75.6%
75.5/94.5
224/280
.653/.635
498
540 hp

274/205
74.8%
85.5/106
253/314
.591/.569
564
612 hp

296/220
74.3%
92.4/114
274/337
.532/.509
609
661
743 hp

228/173
75.8%
-
.409/.318

GM LS1 5.7 L Ported Total Engine Airflow Stage 1 Alum

N/A

68/50
73.5%

138/105
76.1%

203/151
74.4%
-
418 hp

243/191
78.6%
-
500
542 hp

274/222
81.0%
-
564
612 hp

292/245
83.9%
-
601
652
733 hp

230/183
79.5%

GM LS1 5.7 L Ported Total Engine Airflow Stage 1.5 Alum

N/A

2.02/1.57

N/A

68/52
76.5%

139/108
77.7%

200/160
80.0%
62.4/82.6
185/245
.720/.741
411 hp

248/209
84.3%
77.4/108
229/320
.669/.726
510
554 hp

283/237
83.7%
88.3/122
262/363
.611/.658
582
632 hp

300/255
85.0%
93.6/132
277/390
.540/.590
617
670
753 hp

234/194
82.8%
-
.409/.318

GM LS1 5.7 L Ported West Coast Stage 2 Alum

N/A

2.02/1.57

293/223
76.1%
91.4/115
271/341
.527/.516
603
654
735 hp

-
-
-
.409/.318

GM LS1 6.0 L Ported AP Engineering Stage I Alum

N/A

2.02/1.575
3.970

N/A

66/62
93.9%

139/117
84.2%

213/161
75.6%
66.5/82.6
197/245
.766/.743
438 hp

259/200
77.2%
80.8/103
239/304
.699/.692
533
578 hp

283/219
77.4%
88.3/112
262/333
.611/.606
582
632 hp

297/229
77.1%
92.7/118
275/348
.534/.528
611
663
745 hp

305/243
79.7%
95.2/125
282/370
.470/.481
627
681
766 hp

249/195
78.1%
-
.409/.319

GM LS1 6.0 L Ported AP Engineering Alum

235/90

2.08/1.60
4.125
Pipe

N/A

75/63
84.0%

153/115
75.2%

217/163
75.1%
63.9/81.1
189/240
.758/.740
446 hp

265/207
78.1%
78.0/103
231/305
.694/.705
545
591 hp

310/243
78.4%
91.2/121
270/358
.650/.662
638
692 hp

327/262
80.1%
96.2/130
285/386
.571/.595
673
730
821 hp

328/272
82.9%
96.5/135
286/401
.491/.529
675
732
823 hp

329/273
83.0%
96.8/136
287/402
.431/.465
677
734
826 hp

276/219
79.6%
1.40/3.03
.421/.324

GM LS1 6.0 Ported ET Performance Alum

237/-

2.055/1.57
3.90

N/A

67/52
77.6%

138/112
81.2%

198/159
80.3%
59.7/82.1
177/243
.700/.736
407 hp

249/182
73.1%
75.1/94.0
222/279
.660/.632
512
556 hp

286/200
69.9%
86.2/103
255/306
.607/.555
588
638 hp

311/210
67.5%
93.8/108
278/321
.550/.486
640
694
781 hp

236/173
73.0%
1.31
.416/.318

GM LS6

N/A

64/71

236/185
78.4%
-
485
527
592 hp

GM LS6 Ported Stage II ForceFed High Performance

N/A

2.02/1.60

59/64

73/69
94.5%

143/127
88.8%

205/161
78.5%
64.0/80.1
190/237
.738/.731
422 hp

246/198
80.5%
76.8/98.5
227/292
.664/.675
506
549 hp

282/223
79.1%
88.0/111
261/329
.609/.608
580
629 hp

309/231
74.8%
96.4/115
286/340
.556/.525
636
690
776 hp

237/188
79.3%
-
.409/.324

GM LS6 Ported Total Engine Airflow Stage 1 Alum

N/A

2.02/1.57

N/A

64/47
73.4%

145/114
78.6%

215/166
77.2%
67.1/85.7
199/254
.774/.768
442 hp

254/222
87.4%
79.3/115
235/340
.685/.771
523
567 hp

293/244
83.3%
91.4/126
271/373
.632/.678
603
654 hp

290/256
88.3%
90.5/132
268/392
.522/.592
597
647
728 hp

239/200
83.7%
-
.409/.318

GM LS6 Ported Total Engine Airflow Stage 1.5 Alum

N/A

2.02/1.57

N/A

67/50
74.6%

139/119
85.6%

205/174
84.9%
64.0/89.9
190/266
.738/.805
422 hp

254/224
88.2%
79.3/116
235/343
.685/.778
523
567 hp

294/247
84.0%
91.7/128
272/378
.635/.686
605
656 hp

320/257
80.3%
99.9/133
296/393
.576/.595
658
714
803 hp

323/-
101
299
.498
664
721
811 hp

256/204
-
-
.409/.318

GM LS6 Ported Total Engine Airflow Stage 3 Alum

N/A

73/52
71.2%

148/126
85.1%

219/182
83.1%
-
451 hp

269/233
86.6%
-
553
600 hp

311/260
83.6%
-
640
694 hp

346/270
78.0%
-
712
772
868 hp

259/214
82.8%

GM LQ9 Ported Patriot Stage 3 Alum

N/A

2.08/1.60
4.125

76/66
86.8%

145/122
84.1%

207/163
78.7%
60.9/81.1
181/240
.723/.740
426 hp

254/205
80.7%
74.8/102
221/302
.666/.698
523
567 hp

295/229
77.6%
86.8/114
257/337
.618/.624
607
658 hp

320/236
73.8%
94.2/117
279/348
.559/.536
658
714
803 hp

244/191
78.2%
-
.421/.324

Chevy LT1

170/62

1.94/1.50

187/139
74.3%
63.3/78.7
187/233
.525/.505
385
417 hp

190/145
76.3%
64.3/82.1
190/243
.427/.422
391
424 hp

189/142
75.3%
1.12/2.34
.393/.304

Chevy LT1 #372 Alum CHP

170/62

1.94/1.50
-
No Pipe

72/52
72.2%

129/100
77.5%

180/130
72.2%
60.9/73.6
180/218
.674/.630
370 hp

213/142
66.7%
72.1/80.4
214/238
.598/.516
438
475 hp

214/149
69.6%
72.4/84.3
215/250
.481/.433
440
478 hp

215/154
71.6%
72.7/87.1
216/258
.403/.373
442
480
540 hp

190/135
71.0%
1.26/2.48
.393/.304

Chevy LT1 #372 Alum CHP

170/62

1.94/1.50
-
Pipe

72/53
73.6%

129/101
78.3%

180/136
75.6%
60.9/77.0
180/228
.674/.659
370 hp

213/155
72.8%
72.1/87.7
214/260
.598/.563
438
475 hp

214/165
77.1%
72.4/93.4
215/277
.481/.480
440
478 hp

215/171
79.5%
72.7/96.8
216/287
.403/.414
442
480
540 hp

190/146
76.6%
1.26/2.76
.393/.304

Chevy LT1 Ported Total Engine Airflow Stage 2 Alum

N/A

2.00/1.56

N/A

69/56
81.2%

140/119
85.0%

200/165
82.5%
63.7/86.3
189/256
.727/.769
411 hp

244/198
81.1%
77.7/104
230/307
.665/.692
502
545 hp

275/220
80.0%
87.5/115
259/341
.600/.615
566
614 hp

279/237
84.9%
88.8/124
263/367
.507/.552
574
623
700 hp

228/188
82.5%
-
.405/.316

Chevy LT1 Ported Total Engine Airflow Stage 3 Alum

N/A

2.02/1.60

N/A

72/56
77.8%

148/117
79.1%

218/161
73.9%
68.0/80.1
202/237
.784/.731
448 hp

261/204
78.2%
81.4/101
241/301
.704/.695
537
583 hp

289/233
80.6%
90.2/116
267/343
.624/.635
595
645 hp

294/252
85.7%
91.7/125
272/371
.529/.572
605
656
738 hp

294/262
89.1%
91.7/130
272/386
.453/.510
605
656
738 hp

251/205
81.7%
-
.409/.324

Chevy LT4 Alum

195/-

2.00/1.55

156/121
77.6%

208/149
71.6%
66.2/79.0
196/234
.756/.699
428 hp

243/177
72.8%
77.3/93.8
229/278
.662/.622
500
542 hp

265/190
71.7%
84.4/101
250/298
.578/.535
545
591 hp

257/196
76.3%
81.8/104
242/308
.467/.459
529
574
645 hp

226/167
73.8%
1.36
.405/.314

Chevy LT4 Alum CHP

195/-

2.00/1.55
-
No Pipe

78/67
85.9%

147/109
74.1%

197/133
67.5%
62.7/70.5
186/209
.716/.624
405 hp

230/159
69.1%
73.2/84.3
217/250
.627/.559
473
513 hp

250/172
68.8%
79.6/91.2
236/270
.545/.484
514
558 hp

243/177
72.8%
77.3/93.8
229/278
.441/.415
500
542
610 hp

213/150
70.3%
1.28
.405/.314

Chevy LT4 Alum CHP

195/-

2.00/1.55
-
Pipe

78/67
85.9%

147/114
77.6%

197/141
71.6%
62.7/74.7
186/221
.716/.661
405 hp

230/167
72.6%
73.2/88.5
217/262
.627/.587
473
513 hp

250/180
72.0%
79.6/95.4
236/283
.545/.506
514
558 hp

243/185
76.1%
77.3/98.0
229/290
.441/.434
500
542
610 hp

213/157
73.8%
1.28
.405/.314

Chevy L92 Alum CCM

260/90

2.165/1.59
4.03

72/63
87.5%

148/126
85.1%

212/162
76.4%
57.6/81.6
171/242
.712/.740
436 hp

264/189
71.6%
71.7/95.2
212/282
.665/.648
543
589 hp

302/205
67.9%
82.0/103
243/306
.608/.562
621
674 hp

322/214
66.5%
87.5/108
259/319
.540/.489
662
719
808 hp

316/221
69.9%
85.8/111
254/330
.455/.433
650
705
793 hp

261/186
71.4%
1.24/2.46
.438/.322

Chevy L92 CNC Lingenfelter Alum

275/93

2.165/1.59
4.065

N/A

156/116
74.4%

228/160
70.2%
61.9/80.6
184/239
.765/.731
469 hp

280/199
71.1%
76.1/100
225/297
.705/.682
576
625 hp

320/218
68.1%
86.9/110
258/325
.644/.598
658
714 hp

346/229
66.2%
94.0/115
278/342
.581/.523
712
772
868 hp

340/235
69.1%
92.4/118
274/351
.489/.460
699
759
853 hp

278/193
69.3%
1.26/2.53
.438/.322

Manufacturer
Part Number

Port/Vol
Int/Exh

Valve Size Int/Exh

Combust. Chamber Volume

.100

.200

.300

.400

.500

.600

.700

.800

.900

1.000

Average

Chevy L92 CNC Lingenfelter Alum

275/93

2.165/1.59
4.125

N/A

158/116
73.4%

230/161
70.0%
62.5/81.1
185/240
.772/.736
473 hp

282/201
71.3%
76.6/101
227/300
.710/.689
580
629 hp

322/220
68.3%
87.5/111
259/328
.649/.603
662
719 hp

350/231
66.0%
95.1/116
282/345
.587/.528
720
781
878 hp

344/237
68.9%
93.4/119
277/354
.495/.464
708
768
863 hp

281/194
69.2%
1.27/2.55
.438/.322

Chevy L98/'113 Alum

163/-

1.94/1.50

62/-

116/-

161/-

185/-
62.6
185
.520
381
413 hp

195/-
66.0
195
.438
401
435 hp

198/-
67.0
198
.371
407
442
497 hp

171
-
1.21
.393/.304

Chevy L98 Alum

163/-

1.94/1.50

120/100
83.3%

163/129
79.1%
55.1/73.0
163/216
.611/.625
335 hp

189/148
78.3%
63.9/83.8
189/248
.531/.538
389
422 hp

199/164
82.4%
67.3/92.8
199/275
.447/.477
409
444 hp

199/167
83.9%
67.3/94.5
199/280
.373/.405
409
444
499 hp

174/142
81.4%
1.22
.393/.304

Chevy L98 Ported ET Performance Alum

184/-

2.00/1.55
4.03

62.5

67/52
77.6%

129/104
80.6%

187/146
78.1%
59.5/77.4
176/229
.679/.685
385 hp

228/175
76.8%
72.6/92.7
215/275
.621/.615
469
509 hp

242/188
77.7%
77.0/99.6
228/295
.528/.529
498
540 hp

247/193
78.1%
78.6/102
233/303
.449/.452
508
551
620 hp

207/161
78.0%
1.34
.405/.314

Chevy L98 Ported Total Engine Flow Alum

N/A

67/53
79.1%

150/118
78.7%

226/173
76.5%
-
465 hp

287/219
76.3%
-
590
641 hp

332/247
74.4%
-
683
741 hp

353/264
74.8%
-
726
788
886 hp

368/266
72.3%
-
757
821
924 hp

286/215
75.0%

Chevy Turbo

N/A

201/177
88.1%
-
413
449
504 hp

Chevy Vortec L31 Iron

170/61

1.94/1.50

58/43
74.1%

114/88
77.2%

173/125
72.3%
58.5/70.7
173/210
.648/.606
356 hp

216/143
66.2%
73.1/80.9
217/240
.607/.520
444
482 hp

225/149
66.2%
76.1/84.3
226/250
.506/.433
463
502 hp

222/152
68.5%
75.1/86.0
223/255
.416/.368
457
495
557 hp

190/131
69.2%
1.32/2.49
.393/.304

Chevy Vortec L31 / #885 Iron CCM

170/61

1.94/1.50
-
No Pipe

70/48
68.6%

138/101
73.2%

190/129
67.9%
64.3/73.0
190/216
.712/.625
391 hp

227/140
61.7%
76.8/79.2
228/235
.638/.509
467
507 hp

239/147
61.5%
80.9/83.2
240/246
.537/.427
492
533 hp

229/151
65.9%
77.5/85.4
230/253
.429/.366
471
511
575 hp

205/134
65.3%
1.41/2.48
.393/.304

Chevy Vortec L31 / #885 Iron CCM

170/61

1.94/1.50
-
Pipe

70/49
70.0%

139/105
75.5%

190/137
72.1%
64.3/77.5
190/230
.712/.664
391 hp

227/151
66.5%
76.8/85.4
228/253
.638/.549
467
507 hp

239/160
66.9%
80.9/90.5
240/268
.537/.465
492
533 hp

229/162
70.7%
77.5/91.7
230/272
.429/.392
471
511
575 hp

205/143
69.8%
1.41/2.66
.393/.304

Chevy Vortec L31 / #885 Ported Iron CHP

N/A

1.94/1.50

N/A

60/50
83.3%

128/101
78.9%

193/162
83.9%
65.3/91.7
193/272
.723/.785
397 hp

224/181
80.8%
75.8/102
225/303
.629/.658
461
500 hp

239/181
75.7%
80.9/102
240/303
.537/.526
492
533 hp

196/156
79.7%
-
.393/.304

Chevy Vortec Ported McCoy

N/A

266/200
75.2%
-
547
594 hp

Chevy Vortec / Bow Tie Small Port Iron

175/65

2.00/1.55

225/152
67.6%
71.6/80.6
212/239
.613/.535
463
502 hp

235/161
68.5%
74.8/85.3
222/253
.512/.453
483
525 hp

236/163
69.1%
75.1/86.4
223/256
.429/.382
485
527
592 hp

232/159
68.4%
1.35/2.51
.405/.314

Chevy Vortec / Bow Tie Large Port Iron

206/77

2.00/1.55

268/164
61.2%
85.3/86.9
253/258
.487/.384
551
598
673 hp

-
-
1.30/2.13
.405/.314

Chevy / GM Splayed Valve 12 Deg MBE Port

N/A

2.23/1.55
4.155
No Pipe

N/A

140/102
72.9%

221/150
67.9%
56.6/79.5
168/236
.720/.703
455 hp

294/186
63.3%
75.3/98.6
223/292
.719/.654
605
656 hp

354/232
65.5%
90.6/123
269/364
.692/.653
728
790 hp

398/266
66.8%
102/141
302/418
.649/.624
819
888
999 hp

414/273
65.9%
106/145
314/429
.578/.549
852
924
1039 hp

415/280
67.5%
106/148
315/440
.507/.492
854
926
1042 hp

425/278
65.4%
109/147
322/437
.462/.434
874
949
1067 hp

427/-
109
324
.417
878
953
1072 hp

343/221
-
-
.452/.314

Chevy / GM Splayed Valve 10 Deg MBE Port

N/A

-
-
No Pipe

N/A

436/-
-
897
973
1094 hp

Chevy / GM SB2.2 Drag MBE Port Alum

312/-

2.19/1.59
4.15
No Pipe

N/A

70/45
64.3%

156/101
64.7%

240/139
57.9%
63.7/70.0
189/207
.796/.635
494 hp

320/188
58.8%
85.0/94.7
252/281
.796/.644
658
714 hp

377/230
61.0%
100/116
297/343
.751/.631
776
841 hp

413/255
61.7%
110/128
325/381
.685/.583
850
922
1037 hp

426/266
62.4%
113/134
335/397
.606/.521
876
951
1069 hp

439/272
62.0%
117/137
345/406
.546/.466
903
980
1102 hp

339/207
61.2%
1.41
.443/.322

Chevy / GM SB2.2 Drag MBE Port Alum

312/-

2.19/1.59

N/A

450/-
119
354
.448
926
1004
1129 hp

-
-
1.44
.443/.322

Chevy / GM SB2.2 Drag MBE Port Alum

312/-

2.18/1.60
4.155
No Pipe

N/A

61/50
82.0%

142/107
75.4%

224/145
64.7%
60.0/72.1
178/214
.747/.659
461 hp

305/191
62.6%
81.7/95.0
242/281
.763/.651
627
681 hp

364/230
63.2%
97.5/114
289/339
.728/.627
749
812 hp

406/257
63.3%
109/128
322/379
.677/.584
835
906
1019 hp

428/270
63.1%
115/134
340/398
.611/.526
880
955
1074 hp

437/278
63.6%
117/138
347/410
.546/.474
899
975
1097 hp

442/283
64.0%
118/141
351/417
.491/.428
909
987
1109 hp

344/220
64.1%
1.42
.441/.324

Chevy / GM SB2.2 Hendricks - Darin Morgan Alum

N/A

2.18/1.60
-
No Pipe

N/A

132/90
68.2%

214/163
76.2%
57.3/81.1
170/240
.713/.740
440 hp

299/200
66.9%
80.1/99.5
237/295
.748/.681
615
667 hp

386/240
62.2%
103/119
306/354
.772/.654
794
862 hp

410/260
63.4%
110/129
325/383
.683/.590
843
915
1029 hp

425/273
64.2%
114/136
337/402
.607/.531
874
949
1067 hp

442/278
62.9%
118/138
351/410
.553/.474
909
987
1109 hp

449/282
62.8%
120/140
356/416
.499/.427
924
1002
1127 hp

451/287
63.6%
121/143
358/423
.451/.391
928
1007
1132 hp

356/230
64.6%
-
.441/.324

Chevy / GM SB2.2 DEI - Darin Morgan Alum

N/A

2.18/1.60
-
No Pipe

N/A

158/101
63.9%

231/142
61.5%
61.9/70.6
183/209
.770/.645
475 hp

310/180
58.1%
83.1/89.5
246/265
.775/.613
638
692 hp

365/212
58.1%
97.8/105
290/312
.730/.578
751
815 hp

392/244
62.2%
105/121
311/360
.653/.554
806
875
984 hp

397/263
66.2%
106/131
315/388
.567/.512
817
886
996 hp

404/269
66.6%
108/134
321/396
.505/.458
831
902
1014 hp

322/202
62.5%
-
.441/.324

Chevy / GM RO7 - Darin Morgan Alum

N/A

2.18/-

N/A

143/-

220/-

307/-
82.2
244
.768
632
685 hp

372/-
99.7
295
.744
765
830 hp

408/-
109
324
.680
839
911
1024 hp

428/-
115
340
.611
880
955
1074 hp

446/-
119
354
.558
917
995
1119 hp

453/-
121
360
.503
932
1011
1137 hp

451/-
121
358
.451
928
1007
1132 hp

359
-
-
.441

AeroHead Iron CHP

178/70

1.94/1.50

60/48
80.0%

116/101
87.1%

162/141
87.0%
54.8/79.8
162/236
.607/.683
333 hp

219/171
78.1%
74.1/96.8
220/287
.615/.621
451
489 hp

225/185
82.2%
76.1/105
226/310
.506/.538
463
502 hp

226/188
83.2%
76.5/106
227/315
.423/.455
465
504
567 hp

190/157
82.9%
1.27/2.69
.393/.304

AFR LT1 180 Street Alum

180/64

2.02/1.60
4.06
1 3/4" Pipe

56-74

129/108
83.7%

195/156
80.0%
60.8/77.6
180/230
.702/.709
401 hp

240/178
74.2%
74.9/88.5
222/262
.648/.606
494
536 hp

255/190
74.5%
79.6/94.5
236/280
.550/.518
525
569 hp

260/194
74.6%
81.1/96.5
240/286
.468/.441
535
580
653 hp

216/165
76.6%
1.44/3.03
.409/.324

AFR LT1 190 Street Alum

190/64

2.02/1.60

56-74

129/108
83.7%

195/156
80.0%
60.8/77.6
180/230
.702/.709
401 hp

240/178
74.2%
74.9/88.5
222/262
.648/.606
494
536 hp

260/190
73.1%
81.1/94.5
240/280
.561/.518
535
580 hp

262/194
74.0%
81.8/96.5
242/286
.471/.441
539
585
658 hp

217/165
76.1%
1.38/3.03
.409/.324

AFR LT1/LT4 195 Street Alum

195/64

2.02/1.60
4.06
1 3/4" Pipe

56-74

132/108
81.8%

198/156
78.8%
61.8/77.6
183/230
.712/.709
407 hp

240/178
74.2%
74.9/88.5
222/262
.648/.606
494
536 hp

260/190
73.1%
81.1/94.5
240/280
.561/.518
535
580 hp

262/194
74.0%
81.8/96.5
242/286
.471/.441
539
585
658 hp

218/165
75.6%
1.34/3.03
.409/.324

Manufacturer
Part Number

Port/Vol
Int/Exh

Valve Size Int/Exh

Combust. Chamber Volume

.100

.200

.300

.400

.500

.600

.700

.800

.900

1.000

Average

AFR LT1/LT4 210 Race Alum

210/80

2.08/1.60
4.125
1 7/8" Pipe

135/112
83.0%

197/145
73.6%
58.0/72.1
172/214
.688/.659
405 hp

245/185
75.5%
72.1/92.0
214/273
.642/.630
504
547 hp

273/205
75.1%
80.3/102
238/302
.572/.559
562
609 hp

282/215
76.2%
83.0/107
246/317
.493/.488
580
629
708 hp

285/220
77.2%
83.9/109
249/324
.427/.428
586
636
715 hp

236/180
76.4%
1.36/2.75
.421/.324

AFR LT4 220 Race Alum

220/80

2.08/1.60
4.125
1 7/8" Pipe

132/112
84.8%

190/145
76.3%
55.9/72.1
166/214
.664/.659
391 hp

248/185
74.6%
73.0/92.0
216/273
.650/.630
510
554 hp

280/205
73.2%
82.4/102
244/302
.587/.559
576
625 hp

286/215
75.2%
84.2/107
249/317
.500/.488
588
638
718 hp

292/220
75.3%
85.9/109
255/324
.437/.428
601
652
733 hp

238/180
75.8%
1.33/2.75
.421/.324

AFR LT4 227 Race Alum

227/80

2.10/1.60
4.125
1 7/8" Pipe

N/A

135/112
83.0%

192/145
75.5%
55.4/72.1
164/214
.664/.659
395 hp

250/185
74.0%
72.2/92.0
214/273
.649/.630
514
558 hp

288/205
71.2%
83.2/102
246/302
.598/.559
592
643 hp

292/215
73.6%
84.3/107
250/317
.505/.488
601
652
733 hp

295/220
74.6%
85.2/109
252/324
.438/.428
607
658
740 hp

242/180
74.5%
1.30/2.75
.425/.324

AFR LS1 Street Alum

205/78

2.02/1.60
3.90
1 7/8" Pipe

66/76

140/112
80.0%

200/170
85.0%
62.4/84.6
185/251
.720/.772
411 hp

251/203
80.9%
78.3/101
232/299
.677/.692
516
560 hp

281/221
78.6%
87.7/110
260/326
.607/.602
578
627 hp

298/230
77.2%
93.0/114
276/339
.536/.522
613
665
748 hp

234/187
80.0%
1.45/2.95
.409/.324

AFR LS1 Street Alum

225/85

2.08/1.60
3.90
1 7/8" Pipe

66/76

141/116
82.3%

205/171
83.4%
60.3/85.0
179/252
.716/.777
422 hp

252/204
81.0%
74.2/101
220/301
.660/.695
518
562 hp

287/222
77.4%
84.5/110
250/327
.602/.605
590
641 hp

310/232
74.8%
91.2/115
270/342
.542/.527
638
692
778 hp

239/189
79.1%
1.38/2.73
.421/.324

AFR LS1 Street Alum

225/85

2.08/1.60
4.125
1 7/8" Pipe

66/76

150/120
80.0%

220/178
80.9%
64.7/88.5
192/262
.769/.808
453 hp

266/220
82.7%
78.3/109
232/324
.697/.749
547
594 hp

304/241
79.3%
89.5/120
265/355
.637/.657
625
679 hp

320/250
78.1%
94.2/124
279/368
.559/.568
658
714
803 hp

252/202
80.1%
1.42/2.94
.421/.324

AFR LS1 Ported Total Engine Airflow Stage 3 Alum

N/A

68/55
80.9%

141/124
87.9%

207/187
90.3%
-
426 hp

262/241
92.0%
-
539
585 hp

304/268
88.2%
-
625
679 hp

341/278
81.5%
-
701
761
856 hp

346/282
81.5%
-
712
772
868 hp

267/230
86.2%

AFR 180 Street Alum

180/-

2.02/1.60
4.06
1 3/4" Pipe

68-74

129/108
83.7%

195/156
80.0%
60.8/77.6
180/230
.702/.709
401 hp

240/178
74.2%
74.9/88.5
222/262
.648/.606
494
536 hp

255/190
74.5%
79.6/94.5
236/280
.550/.518
525
569 hp

260/194
74.6%
81.1/96.5
240/286
.468/.441
535
580
653 hp

216/165
76.6%
1.44
.409/.324

AFR 180 Comp Alum

N/A

2.02/1.60
4.06
1 3/4" Pipe

144/102
70.8%

206/152
73.8%
64.3/75.6
190/224
.741/.690
424 hp

245/190
77.6%
76.4/94.5
227/280
.661/.647
504
547 hp

260/204
78.5%
81.1/101
240/301
.561/.556
535
580 hp

268/211
78.7%
83.6/105
248/311
.482/.479
551
598
673 hp

225/172
76.5%
-
.409/.324

AFR 190 Alum CCM

N/A

2.02/1.60

N/A

71/67
94.4%

144/121
84.0%

208/157
75.5%
64.9/78.1
192/231
.748/.713
428 hp

244/188
77.0%
76.1/93.5
226/277
.658/.640
502
545 hp

262/202
77.1%
81.8/100
242/298
.566/.551
539
585 hp

261/211
80.8%
81.4/105
241/311
.469/.479
537
583
655 hp

224/176
78.6%
-
.409/.324

AFR 190 Street Alum

190/64

2.02/1.60
-
No Pipe

68-74

129/108
83.7%

195/156
80.0%
60.8/77.6
180/230
.702/.709
401 hp

240/178
74.2%
74.9/88.5
222/262
.648/.606
494
536 hp

260/190
73.1%
81.1/94.5
240/280
.561/.518
535
580 hp

262/194
74.0%
81.8/96.5
242/286
.471/.441
539
585
658 hp

217/165
76.1%
1.38/3.03
.409/.324

AFR 190 Comp Alum

N/A

2.02/1.60

135/110
81.5%

201/157
78.1%
62.7/78.1
186/231
.723/.713
413 hp

243/180
74.1%
75.8/89.5
225/265
.656/.613
500
542 hp

264/195
73.9%
82.4/97.0
244/287
.570/.531
543
589 hp

276/208
75.4%
86.1/103
255/307
.496/.472
568
616
693 hp

224/170
76.0%
-
.409/.324

AFR 195 Street Alum

195/64

2.02/1.60
4.06
1 3/4" Pipe

68-74

132/108
81.8%

198/156
78.8%
61.8/77.6
183/230