TEST ONE

For our baseline test we achieved the highest torque of the day, 490 lb-ft at 4,400 rpm. This is largely due to three reasons: The XE274H camshaft features less duration, the Air Gap intake is a dual-plane manifold, which helps produce a stronger intake signal, and the 750-cfm carburetor is comparatively smaller than the larger 850 we later used.

*750 Mighty Demon carburetor
*Edelbrock Performer RPM Air Gap
*AFR 195 Street Eliminator cylinder heads
*Comp Cams Xtreme Energy 274 cam w/1.52:1 roller rockers
*Westech custom headers with 3-inch collectors
*Jets: Primary: 78 changed to 75; Secondary: 80 changed to 78
*Timing: 37 total

RPMTorqueHPRPMTorqueHP
3,0004362494,700483433
3,1004442624,800480439
3,2004522754,900477445
3,3004602895,000473450
3,4004683025,100469455
3,5004733155,200465460
3,6004773275,300459463
3,7004813395,400453466
3,8004833505,500447468
3,9004853605,600440469
4,0004863705,700434471
4,1004873805,800427471
4,2004893915,900419471
4,3004904016,000411470
4,4004904116,100402467
4,5004894196,200393464
4,600486426Average456377

TEST TWO

For this test we switched intakes from the Performer RPM Air Gap (dual-plane) to the Victor Jr. (single-plane) and recorded improved horsepower at a 200 higher engine rpm (488 hp at 5,900 rpm, compared with Test 1's 471 hp at 5,700 rpm). The peak torque number dropped to 475 lb-ft but at a slightly higher rpm.

*750 Mighty Demon
*Edelbrock Victor Jr. single-plane
*AFR 195 Street Eliminator Cylinder Heads
*Comp Cams Xtreme Energy 274 cam w/1.52:1 roller rockers
*Westech custom headers with 3-inch collectors
*Jets: Primary: 78 changed to 75; Secondary: 80 changed to 78

RPMTorqueHPRPMTorqueHP
3,0004202404,800475434
3,1004232504,900475443
3,2004272605,000475452
3,3004322715,100473459
3,4004382845,200471466
3,5004442965,300468472
3,6004513095,400464477
3,7004563225,500459481
3,8004623345,600453483
3,9004663465,700448486
4,0004693575,800441487
4,1004703685,900434488
4,2004713766,000425486
4,3004723876,100417484
4,4004733976,200407481
4,5004744076,300398478
4,6004754166,400388473
4,700475425Average447379

TEST THREE

After a camshaft change to a bigger XE284H and 1.6:1 roller rockers we moved the horsepower number up considerably to 518. Peak torque stayed flat but was reached at a higher 5,200 rpm.

*750 Mighty Demon
*Edelbrock Victor Jr. single-plane
*AFR 195 Street Eliminator cylinder heads
*Comp Cams Xtreme Energy 284 cam w/1.6:1 roller rockers
*Westech custom headers with 3-inch collectors
*Jets: Primary: 78 changed to 75; Secondary: 80 changed to 78

RPMTorqueHPRPMTorqueHP
3,0004002284,800470430
3,1004042384,900473441
3,2004102505,000475452
3,3004172625,100477463
3,4004242755,200478473
3,5004312885,300476480
3,6004383005,400472485
3,7004453135,500467489
3,8004503265,600462493
3,9004543385,700458497
4,0004573485,800454502
4,1004583575,900452507
4,2004593676,000449513
4,3004613786,100445517
4,4004633886,200439518
4,5004653986,300431516
4,6004674096,400421513
4,700468419Average444380