Valve cover gasket issue.

Early C Bodies - The Slab Side Years

  1. 66Hardtop

    66Hardtop New Member

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    Last week I put new valve cover gaskets in the 383 in my 66 Polara. The old gaskets were originals and petrified. I went with the fel-pro high temperature rubber ones instead of cork. After putting them in all was well but after a few days I noticed the drivers side leaking again. I tightened the bolts and the leak was gone for a few days. Basically I have to retighten it every couple days. These gaskets when I got them were pretty stiff and not very pliable, more like a stiff hard rubber. Maybe it just needs a few heat cycles to conform? Has anybody else used these ones or should I stick to the cork ones? Thanks.
     
  2. Biggredd2069

    Biggredd2069 Member

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    I'm about to do this too. So just gonna follow along!!
     
  3. 1978 NYB

    1978 NYB Warfighter FCBO Gold Member

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    I assume FelPro. What is the part number?
     
  4. HWYCRZR

    HWYCRZR Senior Member FCBO Gold Member

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    Interesting I just put one of these on when I pulled my head the other day. The cork one was new but torqued down once. On a brand new engine I didn’t want to any leak chances so I put a new felpro hi temp on the side I removed. I left the other cork. See what works best longer term. The instructions were clear that adhesive should be used to secure it to the valve cover so it cannot move prior to installation. I guess I will see if one works better than the other.
     
  5. jct

    jct Senior Member FCBO Gold Member

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  6. Newport 66

    Newport 66 Senior Member FCBO Gold Member

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    Make sure the area around the bolt holes on the valve covers is flat. Overtightening can " concave" that part of the cover and they won't seal. I use gascasinch on both sides of the new gasket. If using aluminum valve covers use a thin bead of silicone sealer.
     
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  7. BLUPORT

    BLUPORT Carpe Diem Cras FCBO Gold Member

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  8. Newport 66

    Newport 66 Senior Member FCBO Gold Member

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    I wondered how well those performed. I seem to recall MoPar having orange silicone formed gaskets for B/RB engines. Thanks for the info!
     
  9. BLUPORT

    BLUPORT Carpe Diem Cras FCBO Gold Member

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    I was very impressed. They resist the high heat of the exhaust manifolds, and form fit to fill any imperfections in the heads or VCs.
     
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  10. 1978 NYB

    1978 NYB Warfighter FCBO Gold Member

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    I have used these FelPro VS 50145 R Hi-Performance valve cover gaskets for a 1969 R/T 440 for decades and never had one leak. They are black fiber constructed. They don't move at all during installation. I use a light coat of adhesive just out of habit.

    20190402_195903.jpg
     
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  11. jason99

    jason99 Active Member FCBO Gold Member

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    I have a set of those Tennessee gaskets waiting to go on my 400.
     
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  12. Dobalovr

    Dobalovr Closet Floridian FCBO Gold Member

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    Same thing I use every time Bob! I put the gasket on the cover first with some copper permatex lay them gasket side down on the bench overnight install next day good to go no leaks!
     
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  13. 1978 NYB

    1978 NYB Warfighter FCBO Gold Member

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    :thumbsup::thumbsup:

    :usflag::canada:
     
  14. 66Hardtop

    66Hardtop New Member

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    I popped the drivers side cover off and the gasket disintegrated. I picked up a cork one and so far so good.
     
  15. BLUPORT

    BLUPORT Carpe Diem Cras FCBO Gold Member

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    When I took mine off, they had turquoise overspray on them, but my valve covers had never been painted, aside from the factory. They were cork. Original? Maybe?
     
  16. Castle

    Castle Member

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    I was told to go with cork.... the silicone ones can’t handle the high engine heat and slide all over... especially if they are over tightened.
     
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  17. BLUPORT

    BLUPORT Carpe Diem Cras FCBO Gold Member

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    Silicone is more heat resistant than cork, and if you follow the directions, they're really as good as it gets.
     
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  18. Castle

    Castle Member

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    I hear you, just going with what I was told.... I have the combo cork/silicone on mine.... no problems
     
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  19. BLUPORT

    BLUPORT Carpe Diem Cras FCBO Gold Member

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    I have no stock in Silicone, just that it's the first time I've used it, and I'm more than happy with it.

    Not counting my wife's lady lumps, but I digress.
     
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  20. Castle

    Castle Member

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    Well, that’s a totally different thread!
     
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