Small-Block Top-End Swap - Big Power For Little Cash

Swapping Top-End Parts to Make 523 Horses

Bob Mehlhoff Dec 1, 2006 0 Comment(s)

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

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

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

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.

Sources

Air Flow Research
Valencia, CA 91355
661-257-8124
AirFlowResearch.com
Comp Cams
Memphis, TN 38118
800-999-0853
http://www.compcams.com
Westech Performance
Mira Loma, CA 91752
951-685-4767
www.westechperformance.com
High Velocity Heads
865-573-9151
www.HighVelocityHeads.com
S&B Filters Inc
Ontario, CA

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