Offenhauser valve cover & pcv valve?

Okay all you six offenders,I've got a question.I posted this on another thread but didn't get much response.My 1964 Chevy 230 engine is equipped with a pcv valve vented thru the stock valve cover.I've got an Offenhauser finned aluminum I'd like to use to replace it,but there's no pcv vent hole.I found an oil breather cap with a pcv valve tube in it.Will this be sufficent to vent it properly or will I need something else ?What have some of you done in this situation,pics please.
Thanks....Giz'

 

Yes....as long as you don't have too much base pressure..

Pulling good engine vaccuun at the cap will work...for afairly stock engine and not a all out 1/4 miler running in the 10's or lower....

 

PCV without seperate valve/breather is not pcv. Gotta either find a home for another breather or PCV valve, or just run a breather cap. If you wanna contain the mess, get a closed breather with a tube and run the hose into the air cleaner base.

I hate to advocate cutting up that cool valve cover, but have put grommet holes in many of them using a dremel to dress back the fins. Or you could get a vintage side breather.

Good luck!

 

Very cool looking valve cover...

 

Here's what I did on my slant six (from the Slant 6 Forum):

The Offy valve cover has no provisions for PCV. None. It was designed in early '61 when PCV did not exist, and has not been changed since that time. I've been on the phone a few times to Tay Offenhauser trying to gently push him in the direction of reworking the cover for easy compatibility with all slant-6s made between '60 and '80, not just the first two years' worth of production. Thanks for the reminder to call him again (though he didn't seem all that interested in making any changes).

There are no internal baffles, which is a problem, 'cause it means even if you drill your 1" hole and put in a grommet with a PCV valve, you're going to be ****ing splashed oil into the intake tract via the PCV valve.

Unless/until Offenhauser updates the part, the best way to install PCV is to obtain a Stant 10078 (old # SO-78 ) or AC-Delco 12C26 breather cap:



Drill the Offy cover at the rear to accept the grommet for this cap—that'll be another item to buy; it's a Dorman #42344 (breather grommet for 1970-1995 Chrysler products)—and push the cap into the cover. This cap has an internal filter and a 1" top hole, so just snap a standard Chrysler PCV valve grommet (such as Dorman # 42064) into the top hole and pop a standard Chrysler PCV valve into the grommet, and you're all set.

Then I hid the whole thing under a accessory cone I found at a swap meet.

John

 

Hey John, What kind of intake is that on the slant six? WAY SWEET LOOKIN!

 

If there is room between the valve cover and the firewall you could mount the pcv valve at the back of the valve cover. Or on the inside high up towards the rear. That is what I am thinking about doing with my 292 but I don't have the valve cover yet.

As Shifty said, you have to have a flow of air through the crankcase to have it vent properly or it will be blowing oil out the breather and pushing it out the gaskets.


Obviously this shows a stock v8 engine with stock air cleaner but it shows the theory of why you run a pcv valve. Air in, flow through and air, fumes and pressure out. If you just run a breather it is all pressure, fumes and oil out with nothing in or through.

 

1941ihkb5 - It's an old Offenhauser that I got off e-bay. Using two Carter-Weber 2-barrels - they have progressive linkage: one barrel opens partway before the other one starts to open.

I've got it in a 1935 Dodge Brothers pickup.

Here's a couple of more pics:

John