11-03-2012, 03:13 PM
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CC Member
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Join Date: Dec 2001
Location: Louisville,
KY
Cobra Make, Engine: I'm Cobra-less!
Posts: 9,417
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Not Ranked
Chas,
It depends on the journal size.
Most of the bearing manufacturers tell you to be at about .001"/inch of journal, and you add a half thou for the "hipo" stuff.
My SBC rod journals are usually at around .0020-.0025". BBC journals are the same.
Cleveland, SVO, and FE main journals are around .0027-.003".
My BBF and Windsor stuff is around .003" on the mains. If it's a few tenths each direction, I don't sweat it.
Cup engines run really tight clearances (they are pretty small journal though) and you know what kind of rpms they pull.
There has always been a tendency to start opening up the clearances when "race" is written in front of "engine", but I've never really seen the need.
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