Quick gripe/question....

I'm having a problem with oil coming out of my breather on the pass side valve cover. I'm running Moroso valve covers & this happens everytime I drive the car. The covers don't have baffles built into them, so I'm assuming this is what is causing my problem... Anyone else run into this & find a way to easily fix this? It's not alot of oil, but just enough to aggravate you.

That leads me to this question. Is it ok to run with a breather in each valve cover, or should there be some type of pcv valve or vacuum valve hooked up to one of the sides? (This is on a 66 396, Edelbrock Intake, Heads, Holley carb).

Thanks,
Jake

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Tubby's Drive In
http://members.xoom.com/Pgh_Knights/

I had Moroso valve covers on my 350. Same problem, oil would seep out onto the valve cover. There should be a pcv valve on the driver side valve cover hooked to a vacuum on the carb. I think that if you have the proper vacuum it should not leak but I don't have to worry any more, sold the engine http://www.chevelles.com/forum/smile.gif.



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Chris Dagenais
CST Kelsey
'71 Malibu soon to be 454!
http://member.xoom.com/Gandalf80/Chris'sPage

Jake, get a PCV system set-up on your engine, soon. If not, eventually (and sooner than you might think) oil will be forced past the weakest seal(s) on your motor due to excessive crankcase pressures. Been There Done That! They usually will begin to leak around the intake manifold front and rear rail gaskets and/or the oil pan gaskets.

PCV systems allow these pressures to escape into the intake manifold where they are burned along with the intake charge. When you get your PCV system set-up, make sure that everything is a really tight fit. You want to build as much 'sucking' vacuum power as possible to get all of the crankcase gases out.

No oil control baffles in the valve cover will also throw some oil up into the breather and could cause some oil leaking on the valve cover. I would get the PCV system set up first and see what results you have. Hope this helps.

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70' Malibu - 383 'Dental Gas' Inhaling Stroker! Gold Member #39
Chevellz Alwayz!

I have a PCV system set up on my 350 on the passenger side valve cover attached to full manifold vacuum and a breather on the driver's side valve cover. Even with the PCV system I get some minor oil leakage through the breather. Luckily I have the tall Edelbrock valve covers with the fins so the oil does no drip all over the place. Once a week I just sop up the minor drippage. I've just accepted the fact that this is a fact of life and deal with it. The motor seems to be fine otherwise.

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Bob
Email: bob70@chevelles.com
My Chevelle: members.aol.com/rdcnh/70index.html (http://members.aol.com/rdcnh/70index.html)
Team Chevelle Gold Member #169
New England Chevelle & El Camino Assoc. #085

To fix the problem of aftermarket valve-cover leakage there are two things you can do. 1) shop around for after-market valve covers that have baffles, or 2) remove the baffles from you stock valve covers and epoxy them in!
You should never see excessive crankcase pressure above atmospheric pressure. If you do I would look for excessive blow-by.

Jake,
Moroso makes a special grommet that acts as a baffle. It helps a lot even though it is not as good as the regular baffles. Any speed shop should be able to look it up and get it for you. A PCV system would be preferable for a street driven car, but still may not solve the problem.

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Bill Koustenis
Advanced Automotive Machine
Waldorf Md

1971 Heavy Chevy - original owner
Team Chevelle #100

Jake,

Moroso makes a set of oil deflecter plates that mount above your valve train assembly, I got mine from Jeg's or Summit. Can,t remember who for sure.

Jake,
here i am again. i checked my catalogs and could,nt find the plates i was talking about. then i went to www.moroso.com and found them listed as oil deflectors

Thanks guys, I'll be throwing on the pcv setup over the weekend. I'll look around for those baffles also.

Jake


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Tubby's Drive In
http://members.xoom.com/Pgh_Knights/

Jake
Bill is right about the grommet/baffle from Moroso, a friend of mine has one in his 383 small block and it works fine with no oil comming out the breather. It is made for the push in typs breathers only.
Moroso also makes a baffle that rivets or bolts in place on the inside of the valve cover under the breather hole.
On my car I used a piece of 5/8" rubber fuel line about 5" long. It is a tight press fit up into the breather, almost to top of the of the breather. I left enough sticking out to almost reach the top of the head. When the breather is installed the hose cannot move up or down more than 1/4" either direction. It is a very tight fit and has not moved so far.I also cut the ends of the hose on a 45 deg so it could not move against the head or breather and seal off the end.
This solved 95% of my oil drip problem, so I picked up a foam filter replacement element for the old style Moon valve cover breathers (any foam element designed to work with hot oil would work) and slid it into the hose from the top. This was also a tight fit and has not moved. The foam solved the other 5% so I have no oil leakage from my valve cover breathers.
The grommet is the simplest, but my breather hole is the twist type and they don't make a grommet with a baffle built in for it, only the push-in type.
After you have the PVC set up it should be a easy project to stop any leakage that might be left.
Good luck, GaryR

Jake,
where did you get the pcv setup? can you send me some pics? seawolf06@hotmail.com thanks