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Old 08-11-2019, 11:52 AM   #11
Railcarmover
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Join Date: Apr 2017
Location: Sacramento
Posts: 1,262
Default Re: Engine Blow By or Not

The previous owner of an engine I have added an additional crankcase vent in the valve cover at the rear top.It reduces crankcase pressure at another spot and helps relieve any crankcase pressure in the valve gallery,potentially reducing rear main leakage.It seems to work well.
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