The Wrong Combination Can Set You Back - Danger Mouse Part 5

Heads That Are Too Big Can Hurt Power

Mike Petralia Jan 1, 2003 0 Comment(s)
Sucp_0301_06_z Small_block_chevy_engine Cylinder_heads 2/13

Last Month's Power Recap
In DM's third bash on the dyno we really started to crank out some power, especially considering that DM still wore its stock iron heads and had a mild hydraulic camshaft. DM ended the day with a maximum 386 hp and 438 lb-ft of torque. The average horsepower and torque figures were 316 and 416, respectively (see: Test 12). That was 30 hp and 25 lb-ft more torque than we'd started the day with. Needless to say, we were very impressed with the results.

However, this month, for DM's fourth dyno test, we thought we could do a little better by replacing the stock heads, so we tried a set of S/R Torquers (which we got from Bill Mitchell's Hardcore Racing Products for $415 each) and were taught a lesson in proper parts matching.

Sucp_0301_07_z Small_block_chevy_engine Cylinder_heads 3/13

4th Series Of Dyno Tests
We'll number every series of tests consecutively, starting with the last number of the previous month's tests. We'll also list the last test from the previous month so you'll have something to compare the new tests to. So this month our first new test is number 13. Unless listed, no other changes were made for any test.

Test 12 (last test from last month): Stock 461 heads (62cc chambers, 165cc intake runner volume, 1.94/1.50 valves), Edelbrock Air Gap RPM manifold, Speed Demon 750 carb, 1-inch Wilson spacer, COMP Cams XE262H cam (262/270 adv duration, 218/224 duration @ .050, .462/.469 valve lift, 110 lobe separation) straight up.

Test 13: Install World Products S/R Torquer cylinder heads PN 042660-2 67S (67cc chambers, 170cc intake runner volume, 2.02/1.60 valves).

Send your test suggestions to:
Super Chevy Magazine
Attn: Danger Mouse
720 Hundley Way
Placentia, CA 92870


Westech Performance Group
Mira Loma, CA
Comp Cams
Memphis, TN 38118
Wilson Manifolds
Ft. Lauderdale, FL


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