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Message: [QUOTE="alwaysdiesel, post: 1541671, member: 14250"] So I've working out of town since November and the engine progress has been slow. I got my bottom end all together and mocked up a cyl head but have ran into some issues. I am running test springs on #4 cyl and clearances are tight. Originally I had tack welded a couple old lifters to avoid having my plungers collapse and give me false readings, but my exhaust valves ended up contacting the piston towards the end of the exhaust stroke. So I've swapped back to hydraulic lifters and rechecked my clearances. At TDC compression stroke, there is only 0.054" intake clearance and 0.052" exhaust clearance, Confirmed valves are fully closed. During valve overlap, clearances don't get any tighter than 0.051" on exhaust or intake. My setup is Colt Stg 2 cam, Motorcraft lifters, RCD pushrods (0.007" shorter) factory rocker assemblies, 120# RCD springs, Motorcraft head gasket, Mahle 0.020" Over pistons The block got machined, and I am sitting close to MAX piston protrusion (rough 0.030-0.032") Heads got fully rebuilt, and they say everything was done to "spec" although I've read that most machine shops air on the side of caution and set the valves deeper (0.020" average) They did say they topped the valve stems to account for valve depth but did not give me specific numbers. I will try contacting again this week. I also checked lifter preload, at TDC compression, It took 0.098" to bottom the lifters. I checked max plunger travel and got 0.200", so that would give me 0.102" preload. From what I've read this is fairly normal? Thoughts? [/QUOTE]

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