Re: Rear Main Bearing Drain
The leakage rate from the rear main bearing is caused by clearance..the drain tube size is relative to the drain back of a properly set bearing.Reduction of crankcase pressure in the valve gallery is real,slight pressure there will pressurize the feed oil to the rear main.My engine has a road draft tube off the top rear of the valve cover,I left it intact when i went through the engine after considering its usefulness some.
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