TEST FOUR

Replacing the 750-cfm with an 850-cfm Mighty Demon produced almost no change. Our power numbers stayed very close to as before.

*850 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
3,0003922244,800469429
3,1003962344,900471440
3,2004032465,000474451
3,3004122595,100476462
3,4004202725,200478473
3,5004282855,300477482
3,6004342985,400473487
3,7004413115,500468490
3,8004473245,600462493
3,9004523365,700458497
4,0004553475,800454501
4,1004563565,900450506
4,2004573666,000447511
4,3004593766,100443514
4,4004613866,200439518
4,5004633976,300431517
4,6004654076,400422515
4,700467418Average442378

TEST FIVE

For this test we added a High Velocity Heads (HVH) 2-inch carb spacer and picked up a couple more horses at peak power, bringing the total to 521.

*850 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
*Timing: 37.5 total
*Jets: Primary: 78 changed to 75; Secondary: 80 changed to 78
*Carb spacer

RPMTorqueHPRPMTorqueHP
3,0003872214,800469429
3,1003922324,900472440
3,2004012445,000474451
3,3004102575,100477463
3,4004162705,200478474
3,5004232835,300477481
3,6004312955,400473486
3,7004373085,500468490
3,8004443215,600464494
3,9004513355,700460499
4,0004543465,800457505
4,1004553555,900455511
4,2004573656,000452517
4,3004593766,100447520
4,4004623876,200442521
4,5004643986,300433520
4,6004664086,400424517
4,700467418Average441378

TEST SIX

Finally, we added an S&B 4x15-inch air filter, fired up the dyno, and recorded 523 hp. A number of variables can account for the increase, but the point to drive home is that the filter certainly didn't hurt the performance.

*850 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
*Air filter w/spacer
*Jets: Primary: 78 changed to 75; Secondary: 80 changed to 78

RPMTorqueHPRPMTorqueHP
3,0003942254,800473433
3,1003982354,900475443
3,2004052475,000477454
3,3004142605,100479465
3,4004222735,200480475
3,5004292865,300479484
3,6004342985,400476490
3,7004413115,500472494
3,8004493255,600467498
3,9004563385,700462502
4,0004593505,800459507
4,1004613605,900455511
4,2004623706,000452516
4,3004653816,100448520
4,4004673926,200443523
4,5004694026,300435522
4,6004714126,400425518
4,700472423Average446391

The Prices

MFGPNDescriptionPrice
AFR1040195 Street Eliminator heads$1,400
Comp Cams7972-16Chrome-moly 516-inch pushrods, 7.800-inch$125
Comp Cams812-16Hydraulic Lifters$70
Comp Cams1301-12Pro Magnum Roller rockers 1.52$260
Comp Cams1305-16Pro Magnum Roller rockers 1.60$260
Comp Cams12-246-3Xtreme Energy hydraulic cam XE274H$105
Comp Cams12-250-3Xtreme Energy hydraulic cam XE284H$105
Demon5402010Mighty Demon 850 Carburetor$500
Edelbrock7501Performer RPM Air Gap $206
Edelbrock2975Victor Jr.$186
Fel-Pro1205Intake gasket$14
1003Head gasket2 @ $33
All components were sourced through AFR and Summit Racing.

SOURCE
Air Flow Research
10490 Ilex Avenue, Dept. MMFF
Pacoima
CA  91331
Federal-Mogul Corp.(Fel-Pro)
Southfield
MI
Barry Grant Inc High Velocity Heads
N/A
highvelocityheads.com
COMP Cams S&B Filters Inc
Ontario
CA
Edelbrock Corp
2700 California St
Torrance
CA  90503
310-781-2222
Westech Performance
9-09/-685-4767