Horsepower is not a "derivative" of the torque! Horsepower is a product of the torque and engine speed. Any mechanic should have this function down. And, as I stated previously, I understand that an overhead cam engine SHOULD be more efficient, SHOULD have more power for a given displacement, SHOULD have less valve train inertia, blah, blah, SHOULD be better. But, my response to whoever was in comparison of the Chevy truck engines (Vortec) to the overhead cam (OHC) design. The Chevy is the old pushrod V8. Ford has the Triton OHC design. My point was even though the OHC design SHOULD be better, in this comparison, they are simply NOT. The GM engines out-perform the Ford counterparts in about any way you can look them...MPG, Horsepower, 0-60 mph, etc. So, do you understand my point? When (if?) Ford capitalizes on the inherent design superiority of the OHC design, then GM may follow suit. It takes alot more than reading a "motor book" to understand how to make a really good engine, OHC or pushrod. Oh, by the way, pushrods still rule at the dragstrip. Wonder why?