[67gtospud]

For those of you running an Offenahuser 2-4 intake, where is your pcv located and how’s it plumbed? My offy intake doesn’t have a cutout for the pcv (68-79) location) like my Edelbrock 2-4 had.

Right now I’m looking at ordering a repo 64-67 valley pan with the pcv located in the back BUT I will be running a hydraulic roller cam and wanted to avoid having to clearance the valley pan unless I really need to.

My other option that I’m not sure if it will work or not is to use a 68+ valley pan with a shallow style 90 degree pcv valve and route the hose out the front of intake and loop it back to the front of the carb. This way I could order a tomahawk pan from Butler that they claim clears hydraulic roller lifters.

[Tom Vaught]

If you look on top of the Balance Tube (between the two Carb Mounting Pads,
you will see a 1" diameter slightly raised up casting boss. There should be a
slight "dimple" in the metal in the center.

If you drill that dimple so that you have a hole you can tap for a 3/8" "right angle nipple" with a thread on one end and a hose nipple on the other.

The hole should be drilled deep enough so that you have flow on both sides of that center divider. This will allow the 4 cfm of Crankcase Fumes thru the PCV Valve to go to both planes of intake runners.

Run a 3/8" hose from the nipple to the PCV valve located at the rear of the engine and you are good to go. Some Offy intakes already have that hole drilled and tapped (See Picture).
Click on pic to make larger

Been there done that.

Tom V.

[67gtospud]

Thanks Tom, I was just planning on running the pcv hose to either the front of the front car or rear of the rear carb depending on where the actual pcv valve goes. (Im not running vacuum breaks so the rear port is open on the rear carb.) my main question is which valley pan I need or can run

[PAUL K]

You can use your current valley pan. Drill a hole in the manifold for the PCV valve with a hole saw above the PCV location in the valley pan..done it a dozen times.

[Tom Vaught]

Originally Posted by 67gtospud

Thanks Tom, I was just planning on running the pcv hose to either the front of the front car or rear of the rear carb depending on where the actual pcv valve goes. (Im not running vacuum breaks so the rear port is open on the rear carb.) my main question is which valley pan I need or can run

Not talking much difference in crankcase flow whatever way you do it.
4 or 5 cfm is not going to affect air/fuel ratios one bit.

Tom V.

[John Milner]

I think I used a 389/421 valley pan with the PCV at the rear when I ran an offenhauser dual quad intake.

[goat guy]

I have a Spotts flat valley pan. No clearance issues. Ran my PCV to the valve cover. Got a 90 PCV at the store. Breather on the other cover. Seems to be working fine. Is there a problem with this set up?