A supercharged application with that may cubes calls for at least 2 -12's in my opinion. That is, unless you just plan on putting around to car shows. Excessive crankcase pressure has no positive side effects. You lose power and seals leak. Remember, this is positive pressure not negative with a vacuum pump.
Just to be sure.... you said you're running a PCV valve? I would ASSume then that it's got vacuum to it? OR are you just running -8 VENTS to a breather can?
My brother in laws blown - dual carb - 383 - uses a "normal" PCV to the base of one carb for vacuum - and of course - a vented breather in the opposite valve cover.... and this works fine for a street driven blower motor. If he was hammering it on the strip - then I'd go with Todd on the -12 vented lines to a breather catch can.
Brian Hobaugh SCCA National Tour June 2014
First Hemi 'Cuda Convertible Ever Built
Short clips: Goodguys Pleasanton autocross and pit videos
Excessive crankcase pressure has no positive side effects. You lose power and seals leak. Remember, this is positive pressure not negative with a vacuum pump.
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