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NOTE: There will be a price increase on 1-1-09 to $34.95.
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Cylinder Head Flow Data at 28 Inches of Water

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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.

 
Where do MOST of the numbers come from?



Cylinder Head Flow Data Table

Acura     COPYRIGHT © 2000-2008 Stan Weiss  — World Wide Enterprises
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 RN/AStockN/A-------262/207
79.0%
-
269
292
329 hp
----
1.8l Type R Ported CCHN/AStockN/A-------299/242
80.9%
-
308
334
375 hp
----
1.8l GSRN/AStockN/A-------250/189
75.6%
-
257
279
314 hp
----
1.8l GSR Ported CCHN/AStockN/A-------290/234
80.7%
-
298
324
364 hp
----
RSX Ported CHR Motorsports LLCN/AStockN/A95/113
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%


AMC     COPYRIGHT © 2000-2008 Stan Weiss  — World Wide Enterprises
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 Iron173/732.025/1.62N/A----225/155
68.9%
69.9/75.2
207/223
.484/.417
463
502 hp
----
-
1.30/2.12
.410/.328
AMC SS IronN/A2.08/1.66N/A-----264/-
77.7
230
.461
543
589
663 hp
---
-
-
.421/.336
AMC Iron Ported PaytonN/A2.08/1.62564------270/200
74.1%
79.5/96.4
235/286
.404/.383
555
603
678 hp
--
-
-
.421/.329
Edelbrock 60119, 60139 Alum185/702.02/1.605465/52
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 Alum235/1052.10/1.6561-136/123
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 AlumN/A2.10/1.65N/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 Alum245/1102.19/1.8158-139/114
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 Alum275/1252.19/1.81N/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 Alum300/1342.25/1.8169--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


Audi     COPYRIGHT © 2000-2008 Stan Weiss  — World Wide Enterprises
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 PortN/AStockN/A------177/171
96.6%
-
182
198
222 hp
-----
1.8l T 20 V Small Port Ported CCHN/AStockN/A------238/202
84.9%
-
245
266
299 hp
-----
1.8l T 20 V Large PortN/AStockN/A------212/195
92.0%
-
218
237
266 hp
-----
1.8l T 20 V Large Port Ported CCHN/AStockN/A------257/224
87.2%
-
264
287
323 hp
-----


BMW     COPYRIGHT © 2000-2008 Stan Weiss  — World Wide Enterprises
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 3N/A37mm/ 32mmN/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 LLCN/A30.25mm/ 23.25mmN/A33/31
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 LLCN/A31.25mm/ 24.25mmN/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 LLCN/A31.25mm/ 24.25mmN/A55/35
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 LLCN/A31.25mm/ 24.5mmN/A55/42
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 1N/A-N/A38/37
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 2N/A-N/A36/32
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%


Buick     COPYRIGHT © 2000-2008 Stan Weiss  — World Wide Enterprises
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 AlumN/A1.525/1.35N/A---128/81
63.3%
70.1/56.6
208/168
.457/.327
263
286 hp
----
-
-
.309/.273
Buick 300 V8 AlumN/A1.625/1.312N/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 IronN/A1.875/1.437
4.00
No Pipe
12463/41
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 IronN/A1.875/1.437
4.00
No Pipe
12460/47
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 GNN/A1.71/1.50N/A----156/110
70.5%
67.9/62.2
201/184
.398/.320
241
261 hp
---
-
-
.346/.304
Buick GNN/A1.71/1.50N/A54/50
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 PortedN/A1.77/1.50N/A---196/157
80.1%
79.7/88.8
236/263
.604/.570
302
328 hp
----
-
-
.358/.304
Buick GN1 PortedN/A1.77/1.50
3.875
N/A62/51
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 IronN/A2.13/1.75N/A66/57
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 IronN/A2.13/1.75N/A-----230/189
82.2%
64.5/78.6
191/233
.392/.392
473
513
577 hp
--
-
-
.431/.354
Buick Stage I Ported IronN/A-N/A-----295/205
69.5%
-
607
658
740 hp
--
Buick Stage IIN/A2.13/1.75N/A-----236/213
90.3%
66.2/88.6
196/262
.403/.442
485
527
592 hp
--
-
-
.431/.354
Buick Stock 455 Iron184/142-N/A-----220/150
68.2%
-
453
491
552 hp
--
-
1.20/1.06
Buick 430 #985 Ported TA IronN/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 AlumN/A-N/A101/-162/-234/-344/-
-
708
768 hp
349/-
-
718
779 hp
380/-
-
782
848
954 hp
-294
Edelbrock 60049 Alum215/1302.125/1.756868/58
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 IronN/A2.13/1.75N/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/A2.13/1.755N/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/A2.13/1.75N/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/A2.25/1.80N/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 KentN/A2.225/1.80N/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/A2.25/1.80N/A-----375/265
70.7%
94.3/104
279/309
.606/.535
771
837
941 hp
--
-
-
.456/.365


Cadillac     COPYRIGHT © 2000-2008 Stan Weiss  — World Wide Enterprises
Manufacturer
Part Number
Port/Vol
Int/Exh
Valve Size Int/Exh Combust. Chamber Volume .100 .200 .300 .400 .500 .600 .700 Average
Bulldog Performance Alum260/-2.19/1.847665/61
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 AlumN/A2.19/1.7739------360/-
95.6
283
.512
741
803
904 hp
-
-
-
.443/.358


Chevy     COPYRIGHT © 2000-2008 Stan Weiss  — World Wide Enterprises
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 Tie171/-2.02/1.60N/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 Tie178/--N/A-----221/138
62.4%
-
455
493
555 hp
-----
-
1.24
Chevy Bow Tie #2N/A-N/A----250/174
69.6%
-
514
558 hp
------
Chevy Bow Tie Phase II Iron CCM184/55-6463/57
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 Iron161/65-6460/38
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 CHP155/621.94/1.50
-
No Pipe
7655/45
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 CHP155/621.94/1.50
-
Pipe
7655/45
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 Iron161/632.02/1.6064----216/137
63.4%
67.4/68.1
200/202
.466/.373
444
482 hp
------
-
1.34/2.17
.409/.324
Chevy '461 Ported IronN/A2.02/1.60
4.06
N/A94/65
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 Iron172/62-64-----------
Chevy '462 Iron CCM157/641.94/1.50
-
No Pipe
6250/54
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 CCM157/641.94/1.50
-
Pipe
6250/54
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 Iron157/622.02/1.6064--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 CCM151/591.94/1.50
-
No Pipe
7670/58
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 CCM151/591.94/1.50
-
Pipe
7670/59
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 SycloneN/A-N/A----165/119
72.1%
-
339
368 hp
------
GM LS1 AlumN/A2.00/1.55
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 Alum204/-2.00/1.5565-123/108
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 CHP204/-2.00/1.55
-
Pipe
6583/62
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 Alum235/-2.02/1.575
3.970
Pipe
N/A73/54
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 Alum224/-2.02/1.57
3.90
N/A68/56
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 PerformanceN/A2.02/1.57N/A67/62
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 AlumN/A2.02/1.57N/A67/54
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 AlumN/A2.02/1.57N/A67/57
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 AlumN/A-N/A67/55
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 AlumN/A1.94/1.5763-----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 AlumN/A2.02/1.5766-----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 AlumN/A2.02/1.57N/A67/61
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 AlumN/A-N/A68/50
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 AlumN/A2.02/1.57N/A68/52
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 AlumN/A2.02/1.5770-----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 AlumN/A2.02/1.575
3.970
N/A66/62
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 Alum235/902.08/1.60
4.125
Pipe
N/A75/63
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 Alum237/-2.055/1.57
3.90
N/A67/52
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 LS6N/A-64/71-----236/185
78.4%
-
485
527
592 hp
-----
GM LS6 Ported Stage II ForceFed High PerformanceN/A2.02/1.6059/6473/69
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 AlumN/A2.02/1.57N/A64/47
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 AlumN/A2.02/1.57N/A67/50
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 AlumN/A-N/A73/52
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 AlumN/A2.08/1.60
4.125
7276/66
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 LT1170/621.94/1.5058---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 CHP170/621.94/1.50
-
No Pipe
5872/52
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 CHP170/621.94/1.50
-
Pipe
5872/53
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 AlumN/A2.00/1.56N/A69/56
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 AlumN/A2.02/1.60N/A72/56
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 Alum195/-2.00/1.5556-156/121
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 CHP195/-2.00/1.55
-
No Pipe
5678/67
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 CHP195/-2.00/1.55
-
Pipe
5678/67
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 CCM260/902.165/1.59
4.03
7072/63
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 Alum275/932.165/1.59
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 Alum275/932.165/1.59
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 Alum163/-1.94/1.505862/-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 Alum163/-1.94/1.5058-120/100
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 Alum184/-2.00/1.55
4.03
62.567/52
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 AlumN/A-N/A67/53
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 TurboN/A-N/A-----201/177
88.1%
-
413
449
504 hp
-----
Chevy Vortec L31 Iron170/611.94/1.506458/43
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 CCM170/611.94/1.50
-
No Pipe
6470/48
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 CCM170/611.94/1.50
-
Pipe
6470/49
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 CHPN/A1.94/1.50N/A60/50
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 McCoyN/A-N/A----266/200
75.2%
-
547
594 hp
------
Chevy Vortec / Bow Tie Small Port Iron175/652.00/1.5565---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 Iron206/772.00/1.5565-----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 PortN/A2.23/1.55
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 PortN/A-
-
No Pipe
N/A---------436/-
-
897
973
1094 hp
-
Chevy / GM SB2.2 Drag MBE Port Alum312/-2.19/1.59
4.15
No Pipe
N/A70/45
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 Alum312/-2.19/1.59N/A---------450/-
119
354
.448
926
1004
1129 hp
-
-
1.44
.443/.322
Chevy / GM SB2.2 Drag MBE Port Alum312/-2.18/1.60
4.155
No Pipe
N/A61/50
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 AlumN/A2.18/1.60
-
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 AlumN/A2.18/1.60
-
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 AlumN/A2.18/-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 CHP178/701.94/1.507360/48
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 Alum180/642.02/1.60
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 Alum190/642.02/1.6056-74-129/108
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 Alum195/642.02/1.60
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 Alum210/802.08/1.60
4.125
1 7/8" Pipe
76-135/112
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 Alum220/802.08/1.60
4.125
1 7/8" Pipe
76-132/112
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 Alum227/802.10/1.60
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 Alum205/782.02/1.60
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 Alum225/852.08/1.60
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 Alum225/852.08/1.60
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 AlumN/A-N/A68/55
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 Alum180/-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 AlumN/A2.02/1.60
4.06
1 3/4" Pipe
74-144/102
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 CCMN/A2.02/1.60N/A71/67
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 Alum190/642.02/1.60
-
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 AlumN/A2.02/1.6074-135/110
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 Alum195/642.02/1.60
4.06
1 3/4" Pipe
68-74-132/108
81.8%
198/156
78.8%
61.8/77.6
183/230