Crankcase ventilation
 

I've got an old pair of the SoCal type valve covers that I'd like to powder coat and use, but they have no holes for a PCV valve or other crankcase ventilation. (I want to keep them that way). I've seen show cars/trucks with no evident ventilation holes in the valve covers. Any ideas on just how this is done? Is there a PCV valve hole hidden in some way? :confused:

Older sbc's had the pcv valve in the back of the block. The original 327 that came in my pick up was that way.

that's a tough one. you would need some sort of vent. whether it be PCV or atmospheric. what kind of intake do you have? is there a hole in front for oil fill tube? if so get a cap with a breather in it. otherwise maybe somehow attach a baffle assy from a 70's style VC to bottom front of intake & put PCV valve through a hole in intake. just brainstorming here. any one esle have any ideas?

I have seen PCV's screwed into the oil fill tube on front of intake with a sealed cap.

I'll gladly take those covers off your hands. :)

Here, I have a pic of how my 283 is vented through the rear of the block. The valve is actually threaded to the carb or inline.

Yeah, I remember seeing those vents now. The valve covers had slits in them didn't they? They had to allow for air entry somewhere--was it the valve covers or elsewhere?

Air comes through the vent on top of the oil filler tube on the front of the manifold.

Yep--I remember it now. But I'm still stuck as I don't want to run that oil filler either. The show cars I've mentioned didn't run them, so I'm still in a quandry as to how they do it. :confused:

Why do you think they call them trailer queens, you don't need too much ventilation driving them on and off a trailer.

Unless you have the early style block with the crank vent or filler tube in the front of the Intake manifold your pretty much screwed, Of coarse there is another solution and that would be to have a machinist drill a hole in the back of the block to allow for some type of ventilation, without it you will be forcing seals to blowout to release pressure. If the Valve covers you have are original GM they are collectable for those guys wanting to turn there old cars back to original.


:bowtie: