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  1. #1
    Member Greekman's Avatar
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    Apr 2002
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    Parker, Colorado
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    164
    Corvette(s)
    '67 327/350-'73 LS4-'76 L48-'79 L82

    Default SB Chevy Valve Cover Gaskets?

    Cork or Rubber?

    Wanting to know which are the "Best" valve cover gaskets for the small block 350 chevy engine?

    Looking for the best results for stopping any leaks. I have used cork material in the past, but understand that they may not be the best to use.

    What is everyone's past experiences? Let's hear your opinioins.

    I need help. I have changed my valve cover gaskets three times in the past 12 months and still have a small leak on the passenger side at the rear of the cover.



    .
    Peter M. Gregory
    1973 LS4 Coupe
    NCRS Top Flight-Texas Regional '08

    "Tis a Privilege to Live in Colorado"

  2. #2
    tazdevl35
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    Rubber gets my vote. And they are reuseable. Make sure to straightedge your covers . If they are warped they wont seal





  3. #3
    Member
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    Oct 2003
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    So.San Francisco Ca.
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    130
    Corvette(s)
    1985 Blue Coupe

    Default

    Folk's will argue either way about the merit's of each material,
    Use what You "Preferr".....The only thing I would ADD is a THIN
    Film of RTV on "BOTH" sides of the Gasket's for some ADDED
    sealing Insurance.

  4. #4
    Member Paranoid's Avatar
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    Oct 2000
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    Western PA
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    434
    Corvette(s)
    1970 454 4sp Coupe

    Default

    I've got a pair of these for sale, never used but removed from original package. Right after I bought them I decided not to sink any more $$ into my SB and focus on the 454



    They're Moroso, here's the description:

    MOR-93060 Perm-Align Valve Cover Gaskets, Rubber / Steel, SBF, 3/16 in., Pair $39.95

    They're a steel core coated in durable rubber.

    email me at mozuch@aol.com if interested.

  5. #5
    - Online
    Bob Chadwick's Avatar
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    Aug 2001
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    Norcross, Georgia, United Stat
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    Corvette(s)
    2006 Velocity Yellow Roadster

    Default

    I've been looking at the metal core ones as well.

  6. #6
    Robin7TFour
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    HELLO i prefer rubber with a small amount of yamabond sealer. it's a non-hardening sealer,yes ,a PITA to remove but it does seal very well.
    for correctness i will use cork but add PERMATEX HIGH TACK gasket sealant. brush on both sides to seal . yes, also a PITA to remove . however, once sealed shouldn't have to remove covers too often.

    best to all

    ROBIN

  7. #7
    Member
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    Nov 2002
    Location
    Jersey
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    2,676
    Corvette(s)
    1996 CE LT4

    Default

    I heard that RTV isn't a good sealant becuase it breaks down from gasoline. I don't know this for a fact, this is just what I heard.

    Stallion

  8. #8
    Member Paranoid's Avatar
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    Western PA
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    Corvette(s)
    1970 454 4sp Coupe

    Default

    Oh, for forum members, $25+ shipping.

  9. #9
    Robin7TFour
    Guest

    Default

    STALLION, if you're getting gas on the valve covers .then there is a bigger problem to deal with than just oil leaking from the covers.
    yes, you are right ,to not use them in a gas leak application.

    bubba

  10. #10
    Member
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    Nov 2002
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    Jersey
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    Corvette(s)
    1996 CE LT4

    Default

    That's true.

    But, if you DO happen to get gasoline on the valve covers (for some reason or another), then...your valve cover seal is shot. So... I don't think it's unheard of if a carb throws out, or something of that sort happens. You are right, though, it shouldn't be something to keep you from using RTV over.

    Stallion

  11. #11
    Member Greekman's Avatar
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    Apr 2002
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    Parker, Colorado
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    164
    Corvette(s)
    '67 327/350-'73 LS4-'76 L48-'79 L82

    Default Thanks to everyone.......

    To be completey stock on my car, Chevrolet did not use valve cover gaskets from the St. Louis factory. They were only used by authorized Chevrolet mechanics once the covers needed to be removed for any reason.

    So going rubber would be just as non stock as cork unless they set up higher off the head due to their thickness.

    Tazdev.....
    Tell me more about "planing" or "leveling" the covers if warped?

    On RTV?
    Does everyone use the RTV on both sides of the gasket or just on the cover side and nothing on the head itself?

    Sorry folks for all the questions, but I want to do it right and just ONE more time hopfully!


    .
    Peter M. Gregory
    1973 LS4 Coupe
    NCRS Top Flight-Texas Regional '08

    "Tis a Privilege to Live in Colorado"

  12. #12
    Member
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    Aug 2002
    Location
    Long Island, NY
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    363
    Corvette(s)
    '78 Real S/A, L82, 4spd

    Default

    I just did my manifold and valve covers yesterday. The research I did came up with FelPro's PermaDry. Supposed to be the best. I have the aluminum valve covers. If you get them, go to Autozone, $20.00 there. Haven't started the car yet, waiting for RTV to cure...
    We do not stop playing because we grow old;
    we grow old because we stop playing.

  13. #13

    Join Date
    Jan 2002
    Location
    Washington, Michigan
    Posts
    7,279
    Corvette(s)
    '67 Marina Blue Convertible

    Default Re: Thanks to everyone.......

    Originally posted by Greekman
    To be completey stock on my car, Chevrolet did not use valve cover gaskets from the St. Louis factory. They were only used by authorized Chevrolet mechanics once the covers needed to be removed for any reason.

    So going rubber would be just as non stock as cork unless they set up higher off the head due to their thickness.

    Tazdev.....
    Tell me more about "planing" or "leveling" the covers if warped?

    On RTV?
    Does everyone use the RTV on both sides of the gasket or just on the cover side and nothing on the head itself?

    Sorry folks for all the questions, but I want to do it right and just ONE more time hopfully!
    .
    Chevrolet has ALWAYS used cork valve cover gaskets, on every engine - you're thinking about EXHAUST MANIFOLD gaskets, which were never used until the tubular manifolds started in 1980.

    Make sure your valve cover seal surfaces are dead-flat, especially around the bolt holes, which are usually distorted due to over-torquing the bolts.

    There's no need for RTV on the head side of the gasket - that just ruins the gasket when you remove the covers. After making sure your cover seal surfaces are flat, glue the gaskets to the covers with a small bead of Permatex Ultra-Copper Hi-Temp RTV (making a "ring" around the bolt holes) and let them sit overnight; then install them and check torque on the bolts after a couple of hours of running time. Prepared this way, you can remove and re-install them many, many times with no leaks and no damage to the gaskets.

    I use Fel-Pro cork-lam steel core gaskets, prepare them as outlined above, and have never had a leaker.

    John
    '67 Convertible

  14. #14
    Gone but not forgotten bossvette's Avatar
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    Corvette(s)
    1968 1997

    Default

    ;stupid

    If you are taking a vote I agree with the above, I have Brodix aluminum heads and valve covers and they (the covers) have been off and on several times using sealant on the cover side only.
    Craig sr

  15. #15
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    Bob Chadwick's Avatar
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    2006 Velocity Yellow Roadster

    Default

    John

    Is this what you are referring to?

    Bob

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