How much HP from SBM ProComps? Well... 670HP!

toolmanmike said

Just to show how skewed the calculators can be I plugged your specs into the Wallace Calculator. Speed and weight got you 579 hp. ET and weight got you 680 hp. Now if the calculator were a accurate measure, both HP numbers should be close to the same. The same engine on 2 different dyno's net different results.

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What really messed up the HP numbers on this type of calculator is my gearing. Powerglide (non 3 speed) and a 4.88 rear gear. On my combo with a .650 solid lifter cam it’s Running out of snuff on the top end. Most of the races in my area are now 1/8 mile so even if I upgrade the cam to a .700-.725 lift roller and do some more Port work it will pay little ET dividends.