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I have a 67 chevelle with pumpgas 385 stroker and m22 4 speed have dialed in scattersheild checked all clearances but I keep taking out back of thrust bearing .it looks like someone polished it off with 2000 grit paper it doesn't make a mark on the crank itm happens whil idling in driveway after fire up takes about 15 minutes .This has happened 5 times.i put my wifs LT1 in it with my scattersheild clutchand trans and it runs perfect