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In addition, a PCV system cannot just be disconnected from the valve covers and capped off. There needs to be a way to vent the crankcase pressure that is found in any engine (predominantly due to the gases that inevitably leak past the rings under power). If this pressure is not vented, various seals will be compromised and you'll have oil leaks galore-in addition to potentially damaging the engine otherwise. Our method of choice is to install a valve cover breather, like this one available from Speed Inc. (PN IZM0003). It screws into the factory oil fill cap location and can be had for $44.99. View Related Article
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