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hmm that's more of an issue when your valve springs are worn or you rev to high. when the resonant frequency of the valve spring is hit it will tend to actually keep moving even when the cam is at base circle. I would invest in a set of LSx style beehive springs. they are variable rate so that's less of an issue and it will help to raise your max RPM.
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2000 Tahoe Z71 5.7
1982 Z28 Pacecar 305
1999 S10 
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