Quote:
Originally Posted by Don
Curiosity, the NASCAR motors that turn up to 9,100/9,300 RPM, loose or tight clearances? With the expectation that in the Sprint series the motor only needs to last for one race, probably a full season or less in the Modified series.
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Tight. Under .002".
Loose clearances are a thing of the past. In the 60's/70's everyone kept opening the clearances up. It's not necessary and many SAE studies have shown that excessive clearance can cause
oil to cavitate.