Thanks to all; tomorrow I’m going to block off his PCV. Valve and drive it some? How far to realize if it’s changed? 3 miles? or? ; I wish I had leak down tools but I will run his compression in each cylinder and hopefully not any too different or low ! After all we’ve read here; the third will be an inspection of the intake manifold gaskets if the others check out ok ? Opinions??!
It should show up vertually immediately.
You could get an inexpensive clear case fuel filter. Plumb it into the PCV hose and see if it is filling with oil.
Sucking oil into the intake manifold through the original pluming set up is very common. My parents had a new 76 Granada. It was completely stock with a 302. It was very similar to what I had in my 68 GT350. Sort of a generic Ford PCV set up.
They took it on a 500 mile trip new. When they came back, they had completely sucked the oil pan dry. How they survived and not have blown the engine is beyond me?
That original Ford molded twisted s shaped pcv to intake manifold hose IS part of the issue as is the connection point on the intake manifold.
You may not like the idea of an oil scrapper but here is a picture of what I did.
Early owners (64-5) don't like the idea of a closed breather system. In a sense they are right because of this issue BUT there is lots of data around that shows that they are giving about 25hp away by running open breathers.
IF you look for it, you will actually find a bunch of Shelby Comp cars with open breather systems that have arrived at the point of putting a very similar tank in line to their breathers.
I recently saw an S/C with one plumbed in and it dates from it's original comp days. This is not a rare and unusual solution or condition.
The siphoning is caused by the connection to the intake manifold being lower then the connection to the valve covers and the really bad, cheap quality of the pcv themselves.
Sure it's cool to run the Shelby Comp design of tall filler tubes on the "Comp" valve covers BUT that was done for racing reasons on Comp Cars that didn't have to go 10,000 miles without any kind of service. Rebel against the US Fedral and California emissions rules if you like but it just is foolish to do so. The closed design is just better all around.
You can always go to the head Priest for the Shelby Secret Police and confess that you have sinned and ask for absolution? Maybe for penance they will just make you talk nice to Corvette guys for 10 minutes or so?
Try one of these spiffy pcv's. They are better quality (the best I can find) and the adjustability may help you out some?
http://mewagner.com/?p=444