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Old 10-13-2011, 08:23 AM   #26
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Jgrove is correct, if you vent the pcv without also venting the valve cover, the system will reverse flow. You must disconnect both from the intake, otherwise it's quite pointless. It is also recommended that you drill out the spring in the pcv valve, so more of the fumes will vent through that instead of your valve cover.
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