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Old 08-04-2015, 09:46 AM   #2
geezer#99
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Re: Chevy 250 - Breather or Cap

You need a breather to supply air into the motor, to mix with the fumes and be pulled out with the pcv.
If you use a sealed cap the pcv deadheads and draws nothing. Crankcase pressure builds up and finds a nice gasket to blow out.
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