Thread: 383 air flow ????

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Originally Posted by tango

The best running SB 383 Chevys that I have seen use AFR 195cc Heads .

No argument.

383
AFR195 Comp #1095, 2.08"/1.60, 65cc (order heads with 64cc chambers)
Dual-plane, high rise with 850 carb
1 3/4" long-tube, equal-length tuned headers through mufflers
10.8:1 SCR
9.0:1 DCR with the following cam.....(note for other readers, you couldn't run this DCR on pump gas, but Dave is using E85)
Comp solid roller 12-702-8
http://www.compcams.com/Cam_Specs/Ca...?csid=302&sb=0
RPM HP TQ
2000 152 399
2500 193 405
3000 250 438
3500 321 481
4000 389 511
4500 454 530
5000 511 537
5500 542 517
6000 561 491
6500 554 447
7000 522 391
7500 489 343
8000 414 272
V.E. 102.7% @5000
BMEP 211.7 @5000

Same everything except order heads with 60cc chambers...
11.4:1 SCR
9.5:1 DCR
RPM HP TQ
2000 154 406
2500 196 412
3000 254 445
3500 326 489
4000 396 520
4500 461 539
5000 520 546
5500 552 527
6000 573 502
6500 567 458
7000 539 405
7500 509 356
8000 432 284
V.E. 103.3% @5000
BMEP 215.3 @5000
400+ ft/lbs from 1900 to 7100.... 450+ ft/lbs from 3100 to 6600....500+ ft/lbs from 3700 to 6100....

Change back to 10.8:1 SCR and change cam to Comp 12-900-9
http://www.compcams.com/Cam_Specs/Ca...?csid=310&sb=0
8.477:1 DCR
RPM HP TQ
2000 135 355
2500 175 367
3000 223 391
3500 294 441
4000 369 485
4500 444 518
5000 511 537
5500 548 523
6000 579 507
6500 585 473
7000 579 434
7500 567 397
8000 516 339
V.E. 99.6% @5500
BMEP 211.7 @5000

Same cam, raise SCR to 11.4:1
8.935:1 DCR
RPM HP TQ
2000 138 361
2500 178 373
3000 227 398
3500 299 348
4000 375 493
4500 451 526
5000 520 546
5500 558 533
6000 589 516
6500 600 482
7000 591 444
7500 581 407
8000 533 350
V.E. 100.3% @5500
BMEP 215.2 @5000

Same as above except bolted on a Victor Jr.
RPM HP TQ
2000 128 337
2500 174 365
3000 218 381
3500 287 430
4000 362 476
4500 436 509
5000 497 522
5500 546 521
6000 580 507
6500 599 484
7000 606 455
7500 599 420
8000 558 366
V.E. 100.1% @5500
BMEP 205.9 @5000
As expected, the single plane intake makes more hp above 6500, but gives away torque under 6500.