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Old 11-21-2017, 06:35 PM   #8
bw46
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Join Date: Sep 2015
Location: portland, OR
Posts: 48
Re: Leaking Aluminum valve covers on Aluminum headsV

Above and beyond good parts and installation procedure, I have found valve cover leaks are often caused by inadequate crank case ventilation. It needs to have a working PCV valve or some other form of venting like valve cover breathers. The pressure is going to get out somehow and the valve cover gasket joint can be a weak link.
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