inline PCV part number

Ok, i tried my best to search but came up with nothing.

I'm looking for the PCV that came out in late 60's chevies that threaded into the filler neck. I bought a Fram part number fv100 but it's threaded the wrong way, essentially it is made to thread into the base plate of the carb. Therfore if i threaded it into my intake it would always be shut under vacuum.

Just for some background i'm running early script valve covers and therefore tapped my intake for a PCV (1/4" npt). I might also try a PCV that has a hose barb on either end and just run it inline between the carb and the intake.

 

I ran into the EXACT same situation.
Here's what I found (not complicated, but not short to explain either).
My combo: New GM crate engine, chrome 327 valve covers with no breather holes, Edelbrock C3B intake with oil fill tube.
The diagram I went off of in the YearOne catalogs showed two system: open and closed crank case vent (PCV). These were for '62 283 and 327 engines. These engines, from the factory, had the vent in the back of the block.
On the open system, it's a vented oil fill tube cap with no threaded bung. The vent at the back of the engine went to...I forget if it was the base of the carb or the base of the air cleaner. Didn't matter to me, as I went with the closed stlye.
Closed has a screw-on cap on the oil fill tube. The diagram SHOWED a PCV valve screwed into the oil fill tube, with the hose going to the carb base, and another hose going from the base of the air cleaner lid to the vent in the block. The diagram was wrong.

I searched, and could not find a PCV that had the proper flow direction to be mounted to the oil fill tube. Every one I found was designed to be screwed into the base plate of the carb.

So, I ran a threaded, barbed hose fitting in the oil fill tube.
I ran a 45-degree br*** fitting off the rear of the carb base plate, and installed the PCV valve. I ran a hose from the oil fill tube to the PCV valve.

To make the other half of the vent system, I drilled a hole in the back of the C3B intake, between the back runners and the distributor hole, and weld in a piece of 1/2-inch aluminum tubing. (A/C or fuel line...it came from the s**** bin at work). I could have also just drilled and tapped a hole in this location for a barbed fitting.
(On the bottom of the intake, there were re-inforcement ribs. I drilled my hole between these ribs, and then cut a piece of flat aluminum sheet to go across the ribs, and drilled a single hole in that sheet cover to create a baffled under my tubing)

In my air cleaner base, between the air filter element and the carb throat, I drilled a hole and welded in a short length of 1/2-inch tubing. This tubing connects to the tubing in the intake with a short length of rubber hose. It draws vented air into the valley, flows up through the oil fill tube, thru the PCV in the carbs base, and viola! PCV on a new engine with vintage valve covers and intake.

I did search for the valve to flow the direction you're asking about, and couldn't find it anywhere. I'm not sure it exists. My Car Quest guys are VERY sharp, and we ordered valves for both open and closed 1962 Chevy engines. No dice.

-Brad

 

I have the same manifold and did the same thing you discribed the baffel attached to the ribs.

I actually was thinking about just clamping the 1/2" line over the NPT threads and doing something similar to what you described with the existing PCV...

Thanks for your reply though, confirmed i'm not crazy..

SOOOO... Anybody got part numbers?

 

I believe all the L79 327/350 horse engines used this screw in PCV valve at the oil fill tube. 1966-1967 chevys? I am pretty sure its discontinued at the dealer, maybe ac/delco or ?

 

what about a valve that can lay horizontal with a barb at both ends? Anybody got a recommendation on something like that?

 

The shops that sell Corvette repro parts should be able to help you. Corvettes ran a filler tube with a closed cap and a PCV threaded into it, in the mid '60s. The vacuum was on the unthreaded part.

 

Try Advance Auto online 1967 Chev 1/2 ton pickup with 283. They show 4 different threaded ones. My 67 had a threaded fill tube so one of them should be the right one.
Fred

 

Standard Ignition part # V 112 has a 1/2" barb on one end and 3/8" barb on the other with flow going from the 1/2" to the 3/8". Maybe this will help.