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Message: <blockquote data-quote="96blak54" data-source="post: 1343772" data-attributes="member: 14727">Good read! Writen by David Vizard, no surprise their. Thanks for posting it. .024" is close with a 4" bore!! Piston rocking prohibits such a tight squish, but if the engine it built right it can be achieved. David Vizard has some good stuff and may be worth checking into his books which I have never done. I only know of his name. I agree maximizing the quench is where its at, but you have to know your components. Repeated builds, reducing the squish each time gets you aquainted with the components. Back to your cams, im not degrading your cams used, only enlightening your thoughts.(maybe I should explain modular camshafts in detail for another thread) Combustion starts as soon as the intake valve seats! Not .050" before the seat closes. The big lodes of a modular camshaft can hang the valve open under .050" for a number of duration, unlike the old in block cams of our ancestry. Knowing exactly when the valves open and close is very important to power with any engine, but especially with a mud motor. You would be very surprised at the open/close points of a pi cam. Ramp rates and the ramp rate lobe seperations are what sets cam apart in a modular.</blockquote>