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Message: [QUOTE="Zeb, post: 1529087, member: 30304"] It’s a real pain in the neck to measure piston to valve clearance on these motors. I’ve done a number of Colt Stage 2 cams and here are the measurements that I run for piston protrusion and valve recession and have never had an issue. Piston protrusion must not exceed 0.034” measured directly above the wrist pin. Valve recession must not be less than 0.020”. I prefer a little less piston protrusion than that, but 0.034” is max factory spec, and as long as valve recession and valve stem height is correct it will be fine. Also, I always have run Motorcraft lifters, stock valve springs, and the updated 6.4 length pushrods. A couple of these motors see 40-50 psi boost and plenty of rpm. [/QUOTE]

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