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It's usually best to run a PCV valve. The valve is closed at idle and wide-open throttle (WOT), but draws vapors from the crankcase to the intake under all other throttle positions. At WOT pressure in the crankcase is being pushed out the breather/s since it can't pass the PCV valve, that would otherwise lean the A/F mixture. This means you can run a puke tank on what would be the intake side of the crankcase, i.e., on one side is the PCV circuit and the other is the breather circuit. This allows filtered air to be drawn into the crankcase through the puke tank when the PCV valve is open, but vents the crankcase through the puke tank at WOT. Using this methods gains advantages of both methods, vapor removed at part throttle and crankcase venting at WOT. Just make sure you have a "fill cap" on the puke tank or valve cover that filters air when it is drawn into the crankcase.
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Tom
"If you can make black marks on a straight from the time you turn out of a corner until the braking point of the next turn, then you have enough HORSEPOWER." Mark Donohue
Last edited by speed220mph; 01-22-2008 at 08:41 AM..
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