383 Chevy Engine - The Ultimate 'Stick

Dual-Pattern

Group #1
PN		12-408-8
Grind		XR258HR-10
Intake valve lift		0.480 inch
Exhaust valve lift		0.487 inch
Intake duration at 0.050-inch lift		206 degrees
Exhaust duration at 0.050-inch lift		212 degrees
LSA		110
Intake valve opening		23
Intake valve closing		55
Exhaust valve opening		66
Exhaust valve closing		18
Cranking compression		220 psi
Idle vacuum at 900 rpm		17 inches
Peak torque		483
Peak horsepower		416
Average torque at 2,500-5,500 rpm		456
Average horspower at 2,500-5,500 rpm		345
RPM	TQ	HP
2,500	440	209
3,000	457	261
3,500	480	320
3,800	483	350
4,000	482	367
4,500	471	404
5,000	437	416
5,500	390	408
6,000	N/A	N/A
6,300	N/A	N/A

Group #2
PN	12-423-8
Grind	XR276HR-10
Intake valve lift	0.502 inch
Exhaust valve lift	0.510 inch
Intake duration at 0.050-inch lift	224 degrees
Exhaust duration at 0.050-inch lift	230 degrees
LSA	110
Intake valve opening	32
Intake valve closing	64
Exhaust valve opening	75
Exhaust valve closing	27
Cranking compression	225 psi
Idle vacuum at 900 rpm	17.5 inches
Peak torque	486
Peak horsepower	462
Average torque at 2,500-6,000 rpm	455
Average horsepower at 2,500-6,00 0rpm	368
RPM	TQ	HP
2,500	422	201
3,000	437	249
3,500	472	315
4,000	484	369
4,100	486	379
4,500	484	415
5,000	470	448
5,500	441	462
6,000	397	454
6,300	N/A	N/A

Group #3
PN		12-443-8
Grind		XR294HR-10
Intake valve lift		0.540 inch
Exhaust valve lift		0.562 inch
Intake duration at 0.050-inch lift		242 degrees
Exhaust duration at 0.050-inch lift		248 degrees
LSA		110
Intake valve opening		41
Intake valve closing		73
Exhaust valve opening		84
Exhaust valve closing		36
Cranking compression		200 psi
Idle vacuum at 900 rpm		7.5 inches
Peak torque		508
Peak horsepower		509
Average torque at 2,500-6,300 rpm		467
Average horsepower at 2,500-6,300 rpm		398
RPM	TQ	HP
2,500	397	197
3,000	411	235
3,500	465	310
4,000	498	379
4,500	508	435
5,000	501	477
5,500	480	503
5,900	454	509
6,000	445	508
6,300	414	496

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