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Message: <blockquote data-quote="96blak54" data-source="post: 1343907" data-attributes="member: 14727"><p>You dont, thats the cam companies "secret". I say this because a mod cam can crack a valve under .050" for a number of duration unlike a cam in block engine with tiny cam lobes and a pound of mechanical rods and levers that deflect under demand. A mod has less than .020 deflection when used with a hydraulic lasher, nearly zero when solids lashers are shimmed in. So ....long story short, if the cam manufacturer resist offering cam specs from seat to seat duration, choose a different manufacturer. Knowing the seat to seat duration offers knowledge to cam potential, engine build potential, estimated potential. Cam specs like that are set more for the old school. Although .050" lift gives a good indication of the ramps, but still vague. Lobe separation angle still is a vudoo mythical # the manufacturer spill out. I can sit here all day long an spill cam specs to particular scenario's and keep you confused with numbers, or I can educate you...little by little, so that you come to a better understanding.</p></blockquote><p></p>