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Old 07-14-2019, 01:54 PM
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gasket issues

Hi, My name is Sless, I have a 1974 Nova SS it currently has a 383 stroker engine with 194 heads and Mickey Thompson valve covers. I am having issues with the valve cover gaskets being sucked in and oil sucking into the exaust. New seals have been put in heads with new gaskets but they are still sucking in at the valve cover. sometimes blows oil chunks out exaust i am thinking that is from the build up. I have new exaust to put on but realy need to find out why the gasket is sucking in. do I need different heads or valve covers? or is it something else all together. it is mainly on the side with baffle. Any suggestions would be greatly appreaciated.

Thank You.

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Old 07-14-2019, 02:40 PM
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What are you using for valve cover breathers and/or PCV set-up??

Using a PCV valve but no breather on the opposite side valvecover will cause it to suck in rather hard on closed throttle deceleration from and decent rpm above 3500 rpm.

I've seen engine vacuum suck in and collapse down Moroso stamped anodized aluminum valvecovers to the point they touched the rocker arms, and left the tops of the covers permanently badly bowed down, on a 454 BBC with a PCV and no breather anywhere on the engine..
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Old 07-14-2019, 03:24 PM
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my pvcvalv and breather are both on the passenger side and no pvc or breather on drivers side
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Old 07-14-2019, 03:36 PM
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Also, Thank You for your response, I am new to the forum stuff. My go to guy passed away shortly after I started this restoration project. By your response, does this mean that my problem may be my valve covers. and if so do you recommend a certain style.
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Old 07-14-2019, 03:46 PM
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It sounds like to me the covers aren't flat or the head casting isn't. What gasket are you or have you been using?
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Old 07-14-2019, 04:00 PM
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we have used both neopreme and cork gaskets
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Old 07-14-2019, 04:21 PM
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These are aluminum right?
Have you tried the FP's with the steel core and/or the load spreaders?
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Old 07-14-2019, 05:17 PM
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yes valve covers are heavy aluminum, and I have not used FPs or loadspreaders.
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Old 07-14-2019, 07:48 PM
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Load spreaders won't help with the thick cast M/T valvecovers and wouldn't fit anyway.
Those are just for thin stamped steel or stamped aluminum covers.
PCV and breather both in the same cover isn't a real good way to do it, the breather really should be in the other cover so that the draw of crankcase fumes is through the motor from one side to the other, rather than just in one end of the valvecover and out the other end.

covers are bent or twisted are they?? I've seen them where guys have badly overtightened them and bent them out of flat.

The steel frame core'd valvedover gasket, with either cork facing or silicone rubber might be your best bet.

Make sure your valvecover bolts aren't just a touch too long and bottoming out in the bolt holes in the head before they get the gasket fully tight.
You are checking the bolts and retightening after every heat cycle for the first half dozen times the engine is run, correct?? The gasket will squish and relax when it gets warm, then after a few heat cycles it will settle in and be fine after that. Intake and header gaskets too need the be checked at the same time.

when I use a cork valvecover gasket, I typically glue it to the valvecover with Permatex High Tack or Edelbrock Gasgasinch, and leave it unglued on the cylinder head side. DON"T use RTV silicone it is slippery.
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Old 07-14-2019, 07:57 PM
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I think you might consider installing a breather on the driver side. Keeping the PVC where it is and block the breather, or remove the breather, plug that hole with a rubber plug on passenger side.

The idea, flow is in from the driver side and out the PVC .........passenger side.

Personally I use studs in the head, nuts & small load spreaders for the valve covers, .

Cork gasket, thick to clear roller rockers. No goop, even pressure, enough to seal....

Using sheet metal valve covers, easily distorted if over torqued.

I would think the MT cast alum would be more stout than a sheet metal cover.
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Old 07-14-2019, 08:27 PM
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Sounds like an under intake vacuum leak to me. Leak is larger than the breather can handle, so it sucks the gasket in.Also may be why oil "chunks" are blowing out the pipes.

Check the crankcase for bulding vacuum vs . pressure

Plug the breather and put a vacuum gauge into the PCV hole. Be sure it seals well. Start the motor and let it Idle.

It it builds pressure, you are OK.

If it builds vacuum, you have a vacuum leak under the intake.
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Old 07-15-2019, 07:36 AM
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Quote:
Originally Posted by LATECH View Post
Sounds like an under intake vacuum leak to me.
Also could be screw in studs on the intake side if aluminum heads are being used. Pull one out to see if it goes all the way into the intake port. They need to be sealed by something more than threadlocker.
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