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Hello,
I have a 402 BBC with a 20% under driven 6-71 4.5 # boost, should I run the PCV or breather and plug it ? The cam is mild tremec 5 speed 12 bolt 3.31 gears.. The car is street driven ...

Thanks Billy
 

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You dont really need a PCV valve but like has already been mentioned. You certainly need a PCV system for sure.
 

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BBM and wide and low got it right. BDS and The Blower Shop will also tell you not to use a PCV with a blower due to detonation risks though I know some guys that have run it sucessfully with no problem. With your low boost, high quality breathers in both valve covers are fine. for High boost, a vacuum pump would be nice.
 
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