Not Ranked
As Kieth said, the problem is not making SURE the lifter is on the very bottom of the cam lobe. Your working in thousands of an inch and you can't SEE the cam lobes. Cam lobes have a 'ramp' that begins REALLY close to the 'base circle' (bottom of the lobe). There is an 'accelleration ramp' on one side a 'decelleration ramp' on the other side of the lobe itself. If your even SLIGHTLY on this ramp, one side or the other, you cannot accuratly set the clearance.
So how do you know FOR SURE where you are on the lobe? Tricky, that...
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