never had rocker issues, and I'm on my 5th cam swap doing it that way. only engine issue I've ever had was a rod bearing in an engine that got personal with a few trees. I'm not quite done with my current engine so at the moment 0, to answer your question.
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2000 Tahoe Z71 5.7
1982 Z28 Pacecar 305
1999 S10
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