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MustangSix":1mlrd9vi said:Abandoned67":1mlrd9vi said:
I think your engine has the wrong cap on the rear. With PCV equipped systems, the crank vacuum sucks out fumes and into the manifold thru the PCV valve. Yours has that. But it also needs to be able to pull air into the crankcase.
On later engines there is usually a breather with a hose connected to the air cleaner to provide clean air to the valve cover. On earlier engines it is often just a filtered breather. Yours appears to be either generic twist on cap or a chevy cap.
Good catch, it should be a breather cap.