Thread: PCV/Oil filler tube

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Good Morning Guys & Gals, I have a 350 chevy with a (2 )4 barrel intake.
The intake has an Oil fill tube on the front from a 63 corvette which has the
small PCV tube removed and filled.
My question is can I replace the fill cap on the tube with a push in
type breather and not have to put breathers on my new finned valve
covers? The block I think is a 1972 and my valve covers are the "No hole type".
Thanks so much to all. Coolguy

Guys at the corvette forum c-2 can answer that for sure...

I doubt it would let the engine breathe enough. When the fill tube was in the intake, the blocks also had a road draft tube to take care of crankcase pressure.... It might work without another breather or a pcv valve, worth a try...

With a bit of fabrication on the fill tube in the intake, you could run a pcv valve and a breather cap....

As Denny said, first thing to consider would be the engine condition....might be a good time to do a leak down on it and determine the condition of the rings, valve guides, and seals....

I just went threw this on my truck engine. I didn't put any vents on my valve covers, for the same reason, I thought the filler tube would vent it enough. Wrong, it started blowing oil out of it so bad it would get on my windshield.
I solved it by tapping a hole in the intake runner and another in the manifold that tapped into the valley. Now this is the part I don't understand and if any one here can tell me I would appreciate the info. The engine idled at around 900 rpm, that's where it liked it. I was concerned that buy making a direct vacuum leak in the manifold it would affect the idle and performance (flat spots). Now I hooked up a hose with a pcv valve in it and started it up. It ran kind of funny so I started screwing with the carburetors, and the thing started responding. Now it idles at 700 rpm, no more oil blowing all over the place and all the plugs read the same. I'm tickled to death but I'm not sure I understand why?

Thanks Denny, so if I understand you the pcv is only using enough vacuum to stabilize the pan to the valley?
Ken

I get it, the pcv valve works completely back wards from the way I was thinking. Thanks for your help.
Ken

coolguy - I didn't mean to hijack your thread I hope this helps you too.
Ken

Ken, No problem.My motor only has 600 easy driven miles right now.
After my post yesterday I called the TEC line at Edelbrock.
They said about the same as most of you folks ref.to "Blow By".
They also said that with a new motor such as mine I will be
OK with the breather on the fill tube. Thanks again folks.
Cool Guy

I hope you mean a pcv in the fill tube ,along with the vented cap?
If not ,I sure hope its not pretty under the hood......
Is it manditory....no,will the engine firewall and the rest of the engine be covered in gunk.....yes,will the car have a oil wreek to it ,...yes,that burning oil smell will infiltrate the entire car and you will have a stinker on yer hands.


Do the new oils cake under the valve covers ,without a pcv ,like the old oils did ?

Shawnlee28, Thanks for the reply. Now I don,t know what to do!!!!
Could anyone post some drawings or Pictures. Seems like after looking
at this problem over on the "HAMB" everyone is confused about what
can be done and what cannot be done. As they say "if it was easy
everyone would be doing it" !!!!! LOL. Coolguy

Coolguy Denny helped me with more or less the same problem. I had a pcv valve on one side and a breather on the other but I was getting oil from to much pressure and Denny said to run a breather with a hose to the carb so that the carb sucked all my blowby created by a modified cam and the best thing was at ninety or higher where I was getting oil over my engine there is none now.

This is how mine looks. This is temporary, I will now do it in hard line to blend in with the fuel lines now that I know that it works and why it works, thank you very much.
Ken

Hey Denny, did I make you piddle!!!