Why is their vacuum coming from the breather tube

Asked by Mar 23, 2015 at 09:50 PM about the 1978 Chevrolet C/K 10 Custom

Question type: Maintenance & Repair

The heat riser is working.Its a 350
create engine .Vacuum is very hard
coming in through the valve cover
breather tube .the PVC is working fine.
Its a four carb.with a edlebrock

8 Answers


The tube the pcv is hooked too?

Pvc left valve cover breather tube right valve cover


The tube for the pcv has vacuum or the other one has vacuum?

The breather tube connecTed to the right valve cover has vacuum and the Pvc connected to the carb hasvacuum seems like oil is sucking codown from the breather side of valvecover


Is the vacuum on the breaker coming from the valve cover or from where the tube is connected? And where do you have it connected?


If it's coming from the valve cover the pcv may be stuck open. I've never seen it produce much even in that case but that's the only thing I can think of. The breather tube should be hooked to the air cleaner. There is no vacuum there unless you have a restriction

Pvc is new and your right there should be no vacuum coming from the breather tube I'm thinking maybe intake gasket or the intake itself


So the vacuum is coming from the engine? Where is your breather hooked to?

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