Lou64

I got a 350 crate engine I am installing in my '64. The best I can tell, the valve cover openings are 15/16". I can't find crap to fit them in breathers or grommets. Everything is made for 3/4", 1", or 1 1/4" openings.

The GM Performance engine I bought is apparently their "best seller" so I was wondering if anybody else had this problem.

haccpguy

I think a standard ¾" breather is what you need ( ¾ is the size of the nipple). The ID of the grommet is ¾ and the OD must be the 15/16ths.

Lou64

I agree, but I have scoured the internet (Summit and Amazon tbh) to find one with those dimensions, and haven't yet.

haccpguy

I am not to sure on that 15/16" measurement.

Here is one that will make more sense:
http://www.jegs.com/i/Chevrolet-Perf...31218/10002/-1

2.750'' outside diameter x 1.50'' tall with .750'' nipple
Used on Chevrolet Performance Fast Burn 385, ZZ4 and 350 engines.

devildog

I had the same problem when I threw a set of C-4 valve cover on 1975 400 SBC. The holes are some odd size, try some early 1990's Chevy grommets.

Joe

wmf62

these are just standard PCV grommets.
Bill

Lou64

I just found a 3/4" breather and bought a huge thing of grommets (125 count). Hopefully one of them will fit.

BD104X

I found a breather with a with a 1/2" base at my local Pep Boys in the speed shop aisle (it was a Moroso I think). Also found the correct grommet in the "Help" aisle. I may have the part number in my desk at work if you need it.

Rob Magnano

I just bought a set of finned corvette valve covers with flush mounted breathers they are amazing. You can find them at
Yourcovers.com. The company name is PML. They are in
Los Angeles. Unfortunately they run close to $500.00.
Good luck
Rob

Rob Magnano

Rob Magnano

Your covers.com. <br/>They custom make them With breathers and pcv valve or however you need them <br/>They make them for small block and big block.

RK-TECT

Hi Lou64,
I agree with Rob... I bought a set of PML "Corvette" finned valve covers for my car with the holes & grommets on the side of the covers that face the intake manifold. One is for the breather and the other is for the PCV valve. You can also remove one of the grommets when you add oil using a flexible funnel (most crate engines have a "fugly" oil fill cap on the top of one valve cover). In my opinion, the PML valve covers really transform the look of the engine bay and are worth the money.

, Roger

Rob Magnano

Just some advise. I had to find and use a thicker gasket so the valve cover lip would rise above the edge of my intake manifold.
Rob.

CorvetteMikeB

On my new 350 crate engine I also have valve cover breathers on the left and right side. On the driver's side oil leaks out of the valve cover breather.
What can cause this? Can too much oil cause this to happen?

Tooth Doctor

Put in a PCV valve where you have one of your breathers, that might help. Good luck!

CorvetteMikeB

What side does the PVC valve go on? Driver or passenger side? Pics are helpful

Tooth Doctor

It doesn't matter which side you put the PCV valve on. Most put it on the left side. It works the same either way.

Factoid

Put it in what ever side (usually passenger side) that is closest to the rear of the carb where the pcv hose connects.



This is a Sniper EFI, but same principle. Breather on the driver side, pcv valve on the passenger side.

CorvetteMikeB

Is a PCV valve needed if you already have two air breathers on the valve covers? On your EFI, where did you do the PVC hook ups?

Factoid

I always recommend a pcv valve. It provide for better venting which helps protect engine seals, prevents oil misting in the valve covers and is better for the environment. Here is how mine is connected and keep in mind this is a 540hp 427 sbc.



The middle port on the base of the sniper is the same 3/8” nipple as the pcv valve.

There are three nipples on the rear base of the Sniper. From left to right small nipple manifold vacuum (distributor vacuum advance when not using Sniper controlled timing), large nipple manifold vacuum (pcv valve), small nipple ported vacuum (timed advance, not used).