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: pcv valve with 6-71 402... Yes or No ? rags70ss Feb 23rd, 07, 4:02 PM 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 Schurkey Feb 23rd, 07, 4:51 PM The car is street driven ... You need a PCV system. charbilly2001 Feb 23rd, 07, 6:17 PM You need a PCV system. Period! bbm Feb 23rd, 07, 7:31 PM A PCV valve is a smog device,crankcase vapors can lead to detonation.Put breathers on it. WIDE N LOW Feb 23rd, 07, 7:43 PM Breathers! mkube396 Feb 23rd, 07, 8:28 PM u need a PCV system to suck the vapers out of your crank case. if u dont it can cause acids to build up in your oil and helps with any blow by. dont just stick 2 Breathers on it! Chris R Feb 24th, 07, 3:11 AM You dont really need a PCV valve but like has already been mentioned. You certainly need a PCV system for sure. Tokyo Torquer Feb 24th, 07, 11:46 AM 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. | ||