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Old 03-22-2012, 03:39 AM   #17
amc49
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Looking back over thread I see an error. You NEVER let a brand new motor idle! Bring it up to say 2500 rpm and leave it there for at least 20 minutes. A lot of camshaft lubing is by splash only and idle is too damn slow for that. If your engine building skills are in order the most failure prone part of a new engine is the camshaft lobe to tappet interface............I have seen more cam failures than I care to count simply because someone let it idle before cam wore in right. It's almost certain death with bigger flat tappet cams. We would pull 2 of the 3 springs out of spring stack and break in cam with just one spring, then assemble the other 2 back after the 2500 rpm 20 min. run. That to prevent cams going flat with say .650" lift. That's whopping huge for a flat tappet cam.
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