Running Main Bearing Inserts To use A 383 Journal Crank In a 440 Block

RustyRatRod said

Tom, this confuses me. Since the 383 has smaller mains, don't they actually spin faster than the larger diameter 440 mains would?

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Smaller diameter = less bearing speed.

Look at it like a merry-go-round, the people out at the ends are flying, the people in center are spining but not moving nearly as fast.