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Old 11-17-2008, 01:56 PM
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best cam for a 383 stroker?

I have a 383 stroker in a 68 SWB and I feel like it is lacking some low end torque. I know the cam is the source but I'm having a hard time choosing. any suggestions? I want it to be streetable yet lopey and reliable. thank you!

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Old 11-17-2008, 02:04 PM
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268 on a 108 LSA is a really good grind for a street drive 383. If your compression is over 10:1 you may want to go a little bigger though. If its under 9:1 you may want to go to a 262 on a 107 LSA. The stroker engines like a tighter LSA.
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Old 11-17-2008, 02:53 PM
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All depends on your static compression ratio. In order to build a valid motor that will operate on pump gas, you need to match the intake closing point of the cam to the static compression ratio of the motor and build it with a good, tight squish. Realistically, 0.035" to 0.050". Here are some DynoSim simulations of 383's that I've posted lately.....

383, KB134 hypers, Fel-Pro 1003 gasket, zero deck, 0.041" squish.
AFR195,75cc chambers, 9.60:1 SCR
750 carb
RPM or equivalent manifold
CompCams XR276HR hydraulic roller cam
276*/282*, 224*/230*, 110, 0.535"/0.544" w/1.6 rockers, cam installed 1* advanced.
RPM HP TQ
1500 98 342
2000 148 390
2500 188 394
3000 243 425
3500 309 463
4000 371 487
4500 428 500
5000 468 491
5500 495 472
6000 500 438
6500 470 380

383 10.5:1 SCR
AFR 195 heads, 2.05"/1.60"
750 carb
RPM or equivalent manifold
CompCams XE284H hydraulic flat tappet cam. 284*/296*, 240*/246*, 0.541"/0.544" w/1.6 rockers, 110, IVC 48* ABDC @ 0.050" tappet lift. Installed 2* retarded.
RPM HP TQ
2000 141 370
2500 180 378
3000 229 401
3500 297 446
4000 365 479
4500 432 505
5000 489 513
5500 521 497
6000 542 474
6500 542 438
7000 517 388


383, 10.30:1 static compression ratio. Cylinder volume 783.85 cc's, combustion volume 84.28 cc's, combined volume 868.13 cc's. Heads are 65 cc's, so another 19.28 cc's have to be found between the piston, gasket and piston deck height to reach the 10.30:1 SCR used in this combo. If we shaved the heads for 63 cc chambers, used KB197 pistons with a 12cc dish and a Fel-Pro 1003 gasket (recommended for aluminum heads and iron block) with dimensions of 4.166" X 0.041" and a zero deck, the SCR would work out to 10.31:1 and the squish would work out to 0.041". Sounds pretty close to me. 5.7" rods. (6" rods picked up 3 hp and 2 ft/lbs)
Canfield 195 aluminum heads 2.055"/1.60"
Flow figures: (from 973kgt)
.100 61/51
.200 128 103
.300 191/143
.400 238/170
.500 251/189
.600 254/200
Intake manifold: Dual plane max flow (RPM or equivalent)
Carb: 780 CFM
Cam: Hydraulic Roller.
Intake & exhaust lift at valve 0.560" (1.6 rockers)
Intake & exhaust lift at cam 0.350"
Primary timing seat to seat (0.006") 31/63/77/29
Duration 274*/286* @ 0.006", 230*/236* @ 0.050".
Intake centerline 106*, exhaust centerline 114*, lobe separation angle 110*, overlap 60*.
Secondary timing (0.050") 9/41/52/4
Installed retarded 1*
True seat to seat timing @ 1* retarded 30/64/76/30, ICA 107*, ECA 113*, LSA 110*, overlap 60*.
Lifter acceleration rate 3.10
RPM HP TQ VE BMEP
1500 102 359 67 141
2000 155 407 74 161
2500 197 415 77 164
3000 253 443 83 175
3500 317 476 89 188
4000 377 495 94 195
4500 432 504 98 199
5000 470 494 100 195
5500 496 474 99 187
6000 501 438 95 173
6500 470 380 89 150

383
Dart Iron Eagle 200
Performer RPM
750 carb
1 3/4" headers
9.70:1 SCR
CompCams XR270HR 270/276, 218/224, 0.528"/0.535" (1.6 rockers intake and exhaust), 110 LSA, installed retarded 2*
RPM HP TQ
2000 153 403
2500 194 407
3000 248 435
3500 311 467
4000 370 485
4500 419 489
5000 458 482
5500 472 451
6000 461 403
Over 450 ft/lbs 3200-5500
Calculated using the following flow figures for the heads......
.200 129/114
.300 186/145
.400 229/164
.500 261/172
.600 252/174
Tried 7 different cam grinds. More cam will make a little more horsepower, but the bottom end torque goes away. This cam is the best all around choice. Use the 2000-2200 stall converter you mentioned previously. Plan to buy tires often. (This combo makes 360 ft/lbs @ 1500)
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Old 11-17-2008, 03:19 PM
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Quote:
Originally Posted by 1BAD68
I have a 383 stroker in a 68 SWB and I feel like it is lacking some low end torque. I know the cam is the source but I'm having a hard time choosing. any suggestions? I want it to be streetable yet lopey and reliable. thank you!
What heads are you using? Going overkill on head port volume is also a torque-killer. Knowing the heads will also help us pick a cam.
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Old 11-17-2008, 03:50 PM
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What about your complimentary components, gear ratio, compression ratio, transmission type, stall speed, vehicle weight, cylinder head type, intake and carburetor.

We really need to know that before anybody can spec a camshaft!

Also, what camshaft are you using now?
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