09-08-2011, 04:35 AM
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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: 9,415
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Not Ranked
For a street engine, the bearing clearances are spot on. I usually shoot for between .002-.0025". You have to remember that the Dart blocks use Cleveland main sizes (2.750") and the cranks use SBC rod journals (2.100"). Very small compared to the standard 3.000" main sizes and 2.311" journal sizes of a factory 351W.
Volumetric efficiency mainly has to do with how much air can be shoved into the cylinders. With a modern head/cam package, 100% is certainly achievable.
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