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Message: <blockquote data-quote="AApple" data-source="post: 18452" data-attributes="member: 56">An internal combustion engine is nothing more than an air pump. The more air you can get in, the more work it can perform. So....if you have a cam with more lift, you will be able to draw more air into the cylinder on the intake stoke. More air + more fuel = mo power. Cam lift, duration, rocker arm ratio, intake/exhaust port size/shape/volume, stroke, and cylinder diameter ALL have an effect on how much air can get into the belly of the beast.In theory, a higher lift cam will produce more work(horsepower/torque), but you also have to figure in the duration of that lift...or how long the valve is open at a usable lift. The higher the lift, and longer the duration, the more power can be made to a point. Static compression is very important in regard to that.A 3mm higher lift at the cam lobe is not the same as the corresponding lift at the valve. The rocker arm will change the lift ratio. ON an overhead cam engine, where the cam directly moves the valve is different, since there is no ratio change due to rocker arm ratios.Are you sorry you asked now? :smilie_happy:</blockquote>