383 Chevy Engine - The Ultimate 'Stick

Single-Pattern

Group #1
PN		NA
Grind		3311S/3311SHR110
Intake valve lift		0.480 inch
Exhaust valve lift		0.480 inch
Intake duration at 0.050-inch lift		206 degrees
Exhaust duration at 0.050-inch lift		206 degrees
LSA		110
Intake valve opening		-3
Intake valve closing		29
Exhaust valve opening		37
Exhaust valve closing		-11
Cranking compression		220 psi
Idle vacuum at 900 rpm		16.5 inches
Peak torque		495
Peak horsepower		442
Average torque at 2,500-5,700 rpm		466
Average horsepower at 2,500-5,700 rpm		362
RPM	TQ	HP
2,500	447	213
3,000	462	264
3,500	493	328
3,700	495	348
4,000	492	375
4,500	484	415
5,000	460	438
5,300	438	442
5,500	420	440
5,700	402	437

Group #2
PN		NA
Grind		33145S/33145SHR110
Intake valve lift		0.502 inch
Exhaust valve lift		0.502 inch
Intake duration at 0.050-inch lift		224 degrees
Exhaust duration at 0.050-inch lift		224 degrees
LSA		110
Intake valve opening		6
Intake valve closing		38
Exhaust valve opening		46
Exhaust valve closing		-2
Cranking compression		190 psi
Idle vacuum at 900 rpm		14.5 inches
Peak torque		488
Peak horsepower		454
Average torque at 2,500-6,000 rpm		453
Average horsepower at 2,500-6,000 rpm		365
RPM	TQ	HP
2,500	431	205
3,000	445	254
3,500	478	318
4,000	488	371
4,500	484	415
5,000	463	440
5,500	433	454
6,000	357	408
6,300	NA	NA

Group #3
PN		N/A
Grind		3317S/3317SHR110
Intake valve lift		0.540 inch
Exhaust valve lift		0.540 inch
Intake duration at 0.050-inch lift		242 degrees
Exhaust duration at 0.050-inch lift		242 degrees
LSA		110
Intake valve opening		15
Intake valve closing		47
Exhaust valve opening		55
Exhaust valve closing		7
Cranking compression		190 psi
Idle vacuum at 900 rpm		9.0 inches
Peak torque		497
Peak horsepower		498
Average torque at 2,500-6,300 rpm		461
Average horsepower at 2,500-6,300 rpm		392

RPM	TQ	HP
2,500	405	200
3,000	410	234
3,500	464	310
4,000	490	373
4,500	497	426
5,000	491	468
5,500	469	492
6,000	436	498
6,300	404	485

Final Verdict
Big cams make high-rpm power-but at the expense of low idle vacuum and poor street drivability. Small cams trade a bit of that high-end power but offer good street manners, while providing enough low-rpm torque to hang with even the biggest beast on the streets. In the end it all comes down to a trade-off between drivability and balls-out high-performance power.

ARP 531 Spectrum Circle Oxnard CA 93030 805-278-7223	Hedman Hedders 16410 Manning Way Cerritos CA 90701 310-921-0404 www.hedman.com
MSD El Paso TX 79936 915-857-5200 www.msdignition.com	Holley Performance Products 1801 Russellville Rd. Bowling Green, KY 42101 KY 42101 270-782-2900 www.holley.com
Barry Grant Inc. 1450 McDonald Road, Dept. MMFF Dahlonega GA 30533	Milodon Inc 20716 Plummer St Chatsworth CA 91311 818-407-1211
COMP Cams	Pertronix 440 E. Arrow Hwy. San Dimas CA 91773 800-827-3758 www.pertronix.com
Edelbrock Dept. 5.0 2700 California St. Torrance CA 90503 310-781-2222 www.edelbrock.com	SA Engine Design
Fel Pro Performance Products 5555 Garden Grove Blvd., Dept. CHP Westminster CA 92683	Trick Flow Specialties (TFS) 1248 Southeast Ave. Tallmadge OH 44278
Flowmaster 8-00/-544-4761 www.flowmastermufflers.com

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383 Chevy Engine - The Ultimate 'Stick

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