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The goal of porting heads is to increase the CFM (Cubic Feet Per Minute). The general rule of thumb for every CFM that is gained, an
increase of 1.8 - 2.2 horsepower is likely. This means for a serious street/bracket type engine with a healthy solid cam, some extra compression, single plane intake, ect. we typically see 2 - 2.1hp
gains per CFM. So for example, a head that flowed 225 CFM before modification and improved to 280 CFM through porting, netting a 55 CFM improvement = 110 HP gain. This is a fact, and has been
proven. Please see our "real life" story here.Milder lower compression engines, with hydraullic cams typically see 1.8 HP/CFM gains. And, for all out race type, roller cam, high compression
combos, we have seen 2.2 - 2.3 HP per CFM gains. Keep in mind, NOT EVERYONE gets these gains. But due to our total port design WE DO!! |
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Call (651) 208-7546