I was referring to c. cats original concern, with his 1978 valve cover.  The thread has expanded in to the past..

Got it, and you're right. I glommed onto this thread because it was talking about the seals, but the original intent was the later style.

I'm the one who's guilty of the time shift into the older O-ring style.

On 4/17/2023 at 10:36 AM, Zed Head said:

It's actually a shaped gasket, by CO's picture, not an o-ring.  The question is, does it still exist in the cap.

The fact that oil is leaking from two places kind of suggests blowby pressure.  Maybe a clogged PCV valve or hose.

 

My mechanic argues that the cause for plugs 3 and 4 fouling was due to a damaged pcv valve. I found one around my deposit. How can i ascertain this one is indeed working? How can i clean it?

1 hour ago, 72 Datsun 240z said:

My mechanic argues that the cause for plugs 3 and 4 fouling was due to a damaged pcv valve. I found one around my deposit. How can i ascertain this one is indeed working? How can i clean it?

If you shake it and it rattles, it's good. If it doesn't, it means it's gummed up and should be replaced. They are available at any autoparts store for a few bucks.

Edited April 30, 20251 yr by chaseincats

It's a one way valve. Blow and suck your breath in one side and see if it cuts off the flow.

Very simple to test, so your mechanic is most likely correct.

Personally I've never seen a bad one on a normal running car.

You know that 3 and 4 have their own individual runners so I'm wondering if there's anything resulting from that? Maybe try snugging up the intake bolts? look for soot around the runners.

Try accepting what the mechanic tells you instead of what you're reading on the www.com. He knows more than you, live with it and do what he suggest.

Well he is a mechanic and used to also race a camaro single carburetor car. He is 69 years old. Ill guess ill just wait for the new parts to arrive.