Cleveland Head Flow

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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
Boss 302 C4V Iron N/A 2.19/1.67 N/A - - - 210/154
73.3%
55.7/70.3
165/208
.523/.503
432 hp
469
246/169
68.7%
65.3/77.2
194/229
.49/.441
506 hp
549
274/178
65%
72.7/81.3
216/241
.455/.387
564 hp
612
688
- - - - 243/167
68.6%
-
.443/.338
Boss 302 C4V Mark Workman Iron N/A 2.19/1.67 N/A 71/60
84.5%
149/99
66.4%
221/128
57.9%
58.7/58.4
174/173
.733/.557
455 hp
269/154
57.2%
71.4/70.3
212/208
.669/.503
553 hp
600
287/168
58.5%
76.2/76.7
226/227
.571/.439
590 hp
641
290/176
60.7%
77/80.4
228/238
.481/.383
597 hp
647
728
298/178
59.7%
79.1/81.3
234/241
.424/.332
613 hp
665
748
- - - 252/151
59.6%
-
.443/.338
Ford 351 C2V Iron N/A 2.03/1.67 N/A - - - 200/143
71.5%
61.8/65.3
183/193
.537/.467
411 hp
446
- 199/163
81.9%
61.5/74.4
182/220
.356/.355
409 hp
444
499
- - - - 200/153
76.7%
-
.411/.338
Ford 351 C2V Iron N/A 2.03/1.67 N/A - - - 203/145
71.4%
62.7/66.2
186/196
.545/.473
418 hp
453
- 230/172
74.8%
71.1/78.5
211/233
.412/.374
473 hp
513
577
- - - - 217/159
73.2%
-
.411/.338
Ford 351 C4V D1ZE-GA Iron 244/137 2.19/1.71 76 - - - - - 284/154
54.2%
75.4/67.1
223/199
.471/.327
584 hp
634
713
- - - - -
-
1.16/1.12
.443/.346
Ford 351 C4V CHI Iron N/A 2.19/1.71 N/A 64/38
59.4%
113/78
69%
166/112
67.5%
44.1/48.8
131/144
.551/.476
341 hp
209/135
64.6%
55.5/58.8
164/174
.52/.43
430 hp
466
245/155
63.3%
65/67.5
193/200
.488/.395
504 hp
547
267/160
59.9%
70.9/69.7
210/206
.443/.34
549 hp
596
670
275/-
73
216
.391
566 hp
614
690
- - - 213/128
-
-
.443/.346
Ford 351 C4V Iron N/A 2.19/1.71 N/A - 131/88
67.2%
188/129
68.6%
49.9/56.2
148/166
.624/.548
387 hp
220/146
66.4%
58.4/63.6
173/188
.548/.465
453 hp
491
256/159
62.1%
68/69.2
201/205
.51/.405
527 hp
571
269/165
61.3%
71.4/71.8
212/213
.446/.351
553 hp
600
675
279/166
59.5%
74.1/72.3
219/214
.397/.302
574 hp
623
700
- - - 224/142
63.5%
-
.443/.346
Ford 351 C4V D0AE Closed Chamber Mark Workman Iron N/A 2.19/1.71 N/A 72/54
75%
145/94
64.8%
212/126
59.4%
56.3/54.9
167/163
.704/.535
436 hp
270/151
55.9%
71.7/65.7
212/195
.672/.481
555 hp
603
299/172
57.5%
79.4/74.9
235/222
.595/.439
615 hp
667
302/185
61.3%
80.2/80.6
238/239
.501/.393
621 hp
674
758
304/185
60.9%
80.7/80.6
239/239
.432/.337
625 hp
679
763
- - - 255/152
59.6%
-
.443/.346
Ford 4V Closed Chamber Dr Js Performance Iron N/A 2.19/1.70
-
Pipe
N/A 70/58
82.9%
135/99
73.3%
195/131
67.2%
51.8/57.7
153/171
.647/.56
401 hp
247/156
63.2%
65.6/68.7
194/204
.615/.50
508 hp
551
282/168
59.6%
74.9/74
222/219
.561/.431
580 hp
629
289/177
61.2%
76.7/78
227/231
.48/.378
595 hp
645
725
290/181
62.4%
77/79.7
228/236
.412/.332
597 hp
647
728
290/180
62.1%
77/79.3
228/235
.361/.289
597 hp
647
728
- - 247/156
63.2%
-
.443/.344
Ford 4V Closed Chamber Ported Dr Js Performance Iron N/A 2.25/1.70
-
Pipe
N/A 82/68
82.9%
153/110
71.9%
224/149
66.5%
56.3/65.6
167/195
.724/.637
461 hp
291/180
61.9%
73.2/79.3
217/235
.705/.577
599 hp
649
326/198
60.7%
82/87.2
243/258
.632/.508
671 hp
728
340/211
62.1%
85.5/93
253/275
.549/.451
699 hp
759
853
355/225
63.4%
89.3/99.1
265/294
.491/.412
730 hp
792
891
364/228
62.6%
91.5/100
271/298
.441/.366
749 hp
812
914
- - 293/186
63.4%
-
.456/.344
Ford 4V Closed Chamber Ported BH Performance Iron N/A -
-
No Pipe
N/A 70/64
91.4%
131/107
81.7%
198/145
73.2%
-
407 hp
248/169
68.1%
-
510 hp
554
300/192
64%
-
617 hp
670
322/200
62.1%
-
662 hp
719
808
330/-
-
679 hp
737
828
- - - 255/163
Ford Aussie 2V PowerHeads SF600 Iron N/A 2.04/1.67 69 59/44
74.6%
112/79
70.5%
156/109
69.9%
47.7/49.8
141/147
.556/.474
321 hp
178/130
73%
54.5/59.3
161/176
.476/.424
366 hp
397
187/153
81.8%
57.2/69.9
170/207
.40/.399
385 hp
417
191/172
90.1%
58.4/78.5
173/233
.34/.374
393 hp
426
479
- - - - 165/129
78%
-
.413/.338
Ford Aussie 2V Ported PowerHeads SF600 Iron N/A 2.19/1.71 62 79/75
94.9%
154/109
70.8%
206/156
75.7%
54.7/67.9
162/201
.684/.663
424 hp
231/180
77.9%
61.3/78.4
182/232
.575/.574
475 hp
516
244/200
82%
64.8/87.1
192/258
.486/.51
502 hp
545
253/209
82.6%
67.2/91
199/270
.42/.444
520 hp
565
635
- - - - 218/171
78.5%
-
.443/.346
Ford Aussie 2V Ported John Brides Iron N/A 2.08/1.65 N/A 73/51
69.9%
158/97
61.4%
225/120
53.3%
66.2/56.1
196/166
.786/.529
463 hp
240/139
57.9%
70.6/65
209/193
.629/.459
494 hp
536
246/160
65%
72.4/74.8
215/222
.516/.423
506 hp
549
- - - - - 217/129
59.4%
-
.421/.334
Ford C302 C302B 212/95 2.15/1.65 62 - - - - - - 325/-
89.5
265
.471
669 hp
725
816
- - - -
-
1.53
.435/.334
Ford C302B Stiegemeyer Racing SF600 Ported 217/112 2.19/1.65
4.155
No Pipe
N/A 81/73
90.1%
157/131
83.4%
223/180
80.7%
59.2/84.2
175/249
.74/.793
459 hp
266/210
78.9%
70.6/98.2
209/291
.662/.694
547 hp
594
306/223
72.9%
81.2/104
241/309
.609/.589
629 hp
683
331/228
68.9%
87.9/107
260/316
.549/.502
681 hp
739
831
325/-
86.3
256
.462
669 hp
725
816
- - - 268/194
-
1.53/2.04
.443/.334
Ford D302 D302B 212/95 2.15/1.65 62 - - - - - - 325/-
89.5
265
.471
669 hp
725
816
- - - -
-
1.53
.435/.334
AFD 2V Alum 200/115 2.08/1.60 N/A - 124/105
84.7%
179/140
78.2%
52.7/69.6
156/206
.625/.636
368 hp
231/164
71%
68/81.6
201/242
.605/.559
475 hp
516
271/176
64.9%
79.8/87.5
236/259
.568/.48
557 hp
605
290/185
63.8%
85.3/92
253/273
.507/.42
597 hp
647
728
- - - - 219/154
70.3%
1.45/1.61
.421/.324
AFD 4V Closed Chamber SF300 Alum 235/115 2.15/1.65 N/A 70/55
78.6%
147/108
73.5%
215/151
70.2%
59.2/70.6
175/209
.727/.665
442 hp
269/185
68.8%
74.1/86.5
220/256
.682/.611
553 hp
600
298/205
68.8%
82.1/95.9
243/284
.604/.542
613 hp
665
316/216
68.4%
87/101
258/299
.534/.476
650 hp
705
793
330/221
67%
90.9/103
269/306
.478/.417
679 hp
737
828
- - - 263/181
69%
1.40/1.92
.435/.334
AFD 4V Ported Dr Js Performance Alum N/A 2.19/1.70
-
Pipe
N/A 78/52
66.7%
150/108
72%
216/146
67.6%
57.3/64.3
170/191
.717/.624
444 hp
277/174
62.8%
73.5/76.7
218/227
.689/.558
570 hp
618
318/207
65.1%
84.4/91.2
250/270
.633/.531
654 hp
710
331/224
67.7%
87.9/98.7
260/292
.549/.479
681 hp
739
831
348/236
67.8%
92.4/104
274/308
.495/.432
716 hp
777
873
362/243
67.1%
96.1/107
285/317
.45/.39
745 hp
808
909
- - 286/191
66.8%
-
.443/.344
Avenger XTC 351-C CNC Alum 265/90 2.25/1.74 60/70 75/65
86.7%
145/111
76.6%
217/138
63.6%
54.6/58
162/172
.701/.576
446 hp
281/165
58.7%
70.7/69.4
209/206
.681/.517
578 hp
627
328/214
65.2%
82.5/90
244/267
.636/.536
675 hp
732
344/233
67.7%
86.5/98
256/290
.556/.487
708 hp
768
863
350/247
70.6%
88/104
261/308
.484/.442
720 hp
781
878
360/260
72.2%
90.5/109
268/324
.436/.407
741 hp
803
904
- - 289/195
67.6%
1.36/2.89
.456/.352
Blue Thunder Low-Ex Alum N/A - N/A - - - - - - - 325/210
64.6%
-
669 hp
725
816
- - -
Blue Thunder Ported Alum N/A 2.10/1.65 N/A - - - - - - - 380/265
69.7%
110/124
325/367
.493/.438
782 hp
848
954
- - -
-
-
.425/.334
Blue Thunder Hi-Ex Alum N/A 2.20/1.70 N/A - - - - - - - 325/240
73.8%
85.5/106
253/313
.403/.385
669 hp
725
816
- - -
-
-
.446/.344
Blue Thunder Ported Hi-Ex Alum N/A 2.20/1.71 N/A - - - - - - - 395/285
72.2%
104/124
308/368
.489/.454
813 hp
882
991
- - -
-
-
.446/.346
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
Blue Thunder Stage 3 Ported Alum 220/- 2.20/1.71 N/A - - - - - - 400/300
75%
105/131
312/387
.566/.546
823 hp
893
1004
- - - -
-
1.82
.446/.346
Blue Thunder Comp Ported Alum N/A 2.25/1.70
4.155
N/A - - - - - - 423/311
73.5%
106/137
315/406
.586/.57
870 hp
944
1062
- - - -
-
-
.456/.344
Blue Thunder Custom Performance Stage IV Ported Hi-Ex Alum N/A 2.20/1.71 N/A - - - - - - - 410/295
72%
108/128
320/381
.508/.47
843 hp
915
1029
- - -
-
-
.446/.346
CHI 2V Alum 190/- 2.07/1.65 N/A 77/64
83.1%
147/114
77.6%
207/153
73.9%
61.5/71.6
182/212
.727/.674
426 hp
255/185
72.5%
75.8/86.5
225/256
.671/.611
525 hp
569
286/200
69.9%
85/93.5
252/277
.602/.529
588 hp
638
300/214
71.3%
89.1/100
264/297
.527/.471
617 hp
670
753
298/222
74.5%
88.5/104
262/308
.448/.419
613 hp
665
748
- - - 249/181
72.9%
1.58
.419/.334
CHI 3V Alum 185/- 2.08/1.65 N/A 77/64
83.1%
147/114
77.6%
201/153
76.1%
59.2/71.6
175/212
.702/.674
413 hp
250/191
76.4%
73.6/89.3
218/265
.655/.631
514 hp
558
286/208
72.7%
84.2/97.3
249/288
.60/.55
588 hp
638
290/222
76.6%
85.3/104
253/308
.507/.489
597 hp
647
728
- - - - 235/178
75.6%
1.57
.421/.334
CHI 3V Alum 208/- - N/A 77/64
83.1%
139/114
82%
200/153
76.5%
-
411 hp
248/191
77%
-
510 hp
554
288/208
72.2%
-
592 hp
643
314/219
69.7%
-
646 hp
701
788
- - - - 238/177
74.4%
1.51
CHI 3V CNC Alum 218/- 2.15/1.65 N/A 64/52
81.3%
124/94
75.8%
179/130
72.6%
49.3/60.8
146/180
.605/.573
368 hp
234/159
67.9%
64.5/74.4
191/220
.593/.525
481 hp
522
282/193
68.4%
77.7/90.3
230/267
.572/.51
580 hp
629
314/217
69.1%
86.5/101
256/301
.531/.478
646 hp
701
788
334/230
68.9%
92/108
273/319
.484/.434
687 hp
745
838
350/243
69.4%
96.4/114
286/337
.444/.401
720 hp
781
878
- - 260/181
69.7%
1.61
.435/.334
CHI 3V Ported Kelford Cams Alum 218/- 2.15/1.65 N/A 70/57
81.4%
140/112
80%
197/168
85.3%
54.3/78.6
161/233
.666/.74
405 hp
254/194
76.4%
70/90.7
207/269
.644/.641
523 hp
567
305/209
68.5%
84/97.7
249/290
.619/.552
627 hp
681
336/224
66.7%
92.5/105
274/310
.568/.493
691 hp
750
843
341/234
68.6%
93.9/109
278/324
.494/.442
701 hp
761
856
- - - 262/190
72.5%
1.56
.435/.334
CHI 3V Alum 225/- 2.15/1.65 N/A 70/64
91.4%
140/114
81.4%
205/153
74.6%
56.5/71.6
167/212
.693/.674
422 hp
259/191
73.7%
71.3/89.3
211/265
.657/.631
533 hp
578
295/208
70.5%
81.3/97.3
241/288
.598/.55
607 hp
658
322/219
68%
88.7/102
263/303
.544/.482
662 hp
719
808
340/228
67.1%
93.7/107
277/316
.493/.43
699 hp
759
853
- - - 260/186
71.3%
1.51
.435/.334
CHI 3V CNC Alum 260/- - N/A 78/60
76.9%
150/111
74%
210/150
71.4%
-
432 hp
270/188
69.6%
-
555 hp
603
315/208
66%
-
648 hp
703
340/223
65.6%
-
699 hp
759
853
360/260
72.2%
-
741 hp
803
904
370/230
62.2%
-
761 hp
826
929
- - 288/196
68%
1.42
CHI 4V Alum 228/- 2.19/1.65 N/A 76/64
84.2%
145/114
78.6%
- 256/185
72.3%
68/86.5
201/256
.637/.611
527 hp
571
295/200
67.8%
78.3/93.5
232/277
.587/.529
607 hp
658
315/214
67.9%
83.6/100
248/297
.523/.471
648 hp
703
791
325/222
68.3%
86.3/104
256/308
.462/.419
669 hp
725
816
- - - 267/187
70%
1.43
.443/.334
3V Ported P. I. Motorsorts Alum 213/- 2.19/1.71 60 - 149/102
68.5%
210/137
65.2%
55.7/59.7
165/177
.697/.582
432 hp
257/162
63%
68.2/70.5
202/209
.64/.516
529 hp
574
298/185
62.1%
79.1/80.6
234/239
.593/.472
613 hp
665
317/203
64%
84.2/88.4
249/262
.526/.431
652 hp
708
796
321/221
68.8%
85.2/96.2
252/285
.457/.403
660 hp
716
806
- - - 259/168
65.1%
1.51
.443/.346
CHI Kaase 2.85 C-400 Alum N/A 2.19/1.65 45 69/45
65.2%
153/111
72.5%
225/163
72.4%
59.7/76.2
177/226
.747/.718
463 hp
285/210
73.7%
75.7/98.2
224/291
.709/.694
586 hp
636
337/233
69.1%
89.5/109
265/323
.671/.616
693 hp
752
373/245
65.7%
99/115
293/339
.619/.54
767 hp
833
936
396/253
63.9%
105/118
311/351
.563/.478
815 hp
884
994
400/253
63.3%
106/118
315/351
.498/.418
823 hp
893
1004
- - 310/210
67.7%
-
.443/.334
Edelbrock Performer RPM Alum 190/90 - 60 - - - - - 260/-
-
535 hp
580
653
- - - - -
-
1.37
Edelbrock Performer RPM Alum 190/90 2.05/1.60 60 70/49
70%
139/93
66.9%
205/123
60%
62.1/61.2
184/181
.727/.559
422 hp
242/145
59.9%
73.3/72.1
217/214
.643/.494
498 hp
540
268/161
60.1%
81.2/80.1
241/237
.57/.439
551 hp
598
272/172
63.2%
82.4/85.5
244/253
.482/.391
560 hp
607
683
- - - - 225/139
61.6%
1.43/1.91
.415/.324
P I Motorsports 3V Alum 213/- 2.19/1.71 60 - 149/102
68.5%
210/137
65.2%
55.7/59.7
165/177
.697/.582
432 hp
257/162
63%
68.2/70.5
202/209
.64/.516
529 hp
574
298/185
62.1%
79.1/80.6
234/239
.593/.472
613 hp
665
318/203
63.8%
84.4/88.4
250/262
.528/.431
654 hp
710
798
-/221 - - - 246/158
64%
1.49
.443/.346
Pro Comp Alum 220/90 2.19/1.71 60 65/50
76.9%
107/86
80.4%
162/122
75.3%
43/53.1
127/157
.538/.518
333 hp
208/145
69.7%
55.2/63.1
164/187
.518/.462
428 hp
464
245/160
65.3%
65/69.7
193/206
.488/.408
504 hp
547
267/168
62.9%
70.9/73.2
210/217
.443/.357
549 hp
596
670
- - - - 198/136
68.9%
1.21/1.87
.443/.346
Pro Comp Ported Speed-O-Motive Alum 230/110 2.19/1.71 74 65/54
83.1%
141/108
76.6%
200/147
73.5%
53.1/64
157/190
.664/.625
411 hp
247/176
71.3%
65.6/76.6
194/227
.615/.561
508 hp
551
285/200
70.2%
75.7/87.1
224/258
.567/.51
586 hp
636
318/217
68.2%
84.4/94.5
250/280
.528/.461
654 hp
710
798
335/230
68.7%
88.9/100
264/297
.476/.419
689 hp
748
841
342/238
69.6%
90.8/104
269/307
.426/.379
704 hp
763
858
- - 267/188
70.4%
1.49/2.16
.443/.346
Trick Flow SF600 Alum 190/- 2.08/1.60 62 68/55 140/111 202/151 248/187 286/217 299/232 - - - - -
-
1.47
.421/.324
 
Trick Flow CNC TEA Alum 225/115 2.08/1.60
4.125
1 7/8" Pipe
60 68/55
80.9%
146/115
78.8%
223/162
72.6%
65.6/80.6
194/239
.779/.736
282/204
72.3%
83/101
246/301
.739/.695
313/231
73.8%
92.1/115
273/340
.656/.63
336/240
71.4%
98.9/119
293/354
.587/.545
339/244
72%
99.8/121
296/360
.508/.475
- - - 273/199
73%

 

 

 

The following From Mopar1

 

Cleveland
Manufacturer /Part Number Port/Vol
Intake / Exhaust
Valve Size Intake / Exhaust Combust. Chamber Volume .100"
Intake / Exhaust
.200"
Intake / Exhaust
.300"
Intake / Exhaust
.400"
Intake / Exhaust
.500"
Intake / Exhaust
.600"
Intake / Exhaust
.700"
Intake / Exhaust
.800"
Intake / Exhaust
.900"
Intake / Exhaust
1.000"
Intake / Exhaust
Average
Intake / Exhaust
Ford 351 C2V Iron N/A - N/A - - - 203/145
71.43%
418 hp
- 230/172
74.78%
473 hp
513 hp
- - - - 216.5/158.5
73.21%
Ford 351 C4V D1ZE-GA Iron 244/137 2.190/1.710 76 - - - - - 284/154
54.23%
584 hp
634 hp
- - - - N/A
N/A
1.164/1.124
Ford 351 C4V Iron N/A - N/A - 131/88
67.18%
188/129
68.62%
220/146
66.36%
453 hp
256/159
62.11%
527 hp
269/165
61.34%
553 hp
600 hp
279/166
59.50%
623 hp
- - - 223.8/142.2
63.51%
Ford Aussie 2V Iron N/A - N/A 59/44
74.58%
112/79
70.54%
156/109
69.87%
178/130
73.03%
366 hp
187/153
81.82%
385 hp
- - - - - 138.4/103.0
74.42%
Ford Aussie 2V Ported PowerHeads Iron N/A 2.190/1.710 62 79/75
94.94%
154/109
70.78%
206/156
75.73%
231/180
77.92%
475 hp
244/200
81.97%
502 hp
- - - - - 182.8/144.0
78.77%
Ford Aussie 2V Ported John Brides Iron N/A 2.080/1.650 N/A 73/51
69.86%
158/97
61.39%
225/120
53.33%
240/139
57.92%
494 hp
246/160
65.04%
506 hp
- - - - - 188.4/113.4
60.19%

 

HRD Yates/C3 Cup Head N/A 2.160/1.580 N/A ------ 145/114
78.62%
224/171
76.34%
291/232
79.73%
599 hp
339/252
74.34%
697 hp
364/265
72.80%
749 hp
812 hp
379/272
71.77%
846 hp
- - - 290.3/217.7
74.97%

 

 

Yates SB Ford Head

CNC Ported

   

88.6

.1

165.2

.2

248.7

.3

308.6

.4

351.4

.5

368.0

.6

73.7

.1

128.9

.2

169.7

.3

210.9

.4

253.8

.5

265.3

.6

Blue Thunder SB Ford

Out Of Box

2.15 1.625 83.9 160.5 236.1 292.7 332.4 360.9 71.3 130.5 168.1 192.8 214.2 224.1

 

Yates Heads Part # E3ZM-6049-C3 239cc Aluminum heads Ported
Flow numbers 28" of water, 4.060" bore, 2" inlet plate, 1" radius, 2.25" port pipe x 12"
.              .100"   .200"    .300"    .400"    .500"    .600"    .700"    .800"
Intake      73.1   146.2   216.8   268.7   306.4   317.4   311.2   313.9
Exhaust  53.6   104.1   145.1   179.1   206.1   229.5   244.1   254.9

Bud Moore Wood Bros Davis Racing A3 C302
Lift C302 canted Yates head Yates head unported? unported
-----

0.050 33.10 30.10 29.30 32.10 30.4
0.100 69.10 66.10 63.60 67.80 66.2
0.150 115.4 104.6 102.1 105.4 97.4
0.200 152.2 144.7 138.9 142.2 129
0.300 217.5 220.8 214.1 217.5 189
0.400 267.7 277.7 277.7 274.4 229
0.500 306.2 314.5 324.6 311.2 246
0.600 332.9 311.2 326.2 329.6 251
0.700 --- --- --- --- ---
0.800 --- --- --- --- ---

Exhaust Air Flow

Bud Moore Wood Bros Davis Racing A3 C302
Lift C3 canted Yates head Yates head ported unported
-----

0.050 21.40 21.40 23.90 23.90 28.3
0.100 50.20 46.00 51.00 51.90 57.7
0.150 78.60 72.80 77.80 80.30 76.8
0.200 108.7 95.40 100.4 97.00 93.9
0.300 142.2 138.9 135.5 125.5 108
0.400 202.4 179.0 187.4 153.9 116.6
0.500 219.2 214.1 212.5 184.0 119.4
0.600 224.2 237.6 227.5 205.8 ---
0.700 234.2 249.3 230.9 224.2 ---
0.800 235.9 254.3 --- 234.2 ---

Note: The Yates heads have 2.1" intakes and 1.6" exhausts.
The C302 canted valve heads had 2.15" intakes and 1.65" exhausts.
The A3 have 2.19" intakes and 1.71" exhausts.  

___________________________________________________________________________ 

 _____________________________________________________________________________________________________

flow numbers of the Cleveland 2Vs  heads

lift    intake    exhaust    (exhaust/intake)

.100      3         63              86%

.150    115         79              69

.200    153         95              62

.250    189        113              60

.300    212        128              60

.350    218        142              65

.400    218        151              69

.450    218        161              74

.500    218        170              78

.550    219        176              80

.600    219        183              84

.650    219        186              85

 

FLOW-TEST-aussie-2V.gif picture by strokerengine