Intake gaskets, different slant - NCRS Discussion Boards

Intake gaskets, different slant

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  • Kenn S.
    Very Frequent User
    • September 10, 2009
    • 173

    Intake gaskets, different slant

    If you were following the recent posting regarding intake gaskets, we learned that Gary Pronesti ("Gary P") is the member to talk to regarding purchasing the proper intake gaskets for judging. If you need to contact him, I have his number...just PM me and I'll provide it. I hesitate to post it on the open Web without his knowledge/permission. (Thank you Ron.)

    However, as it happens, Gary knows small blocks. Me, I have a big block, a '70 LS-5. While he does have some 454 end gaskets available, he's not sure (and neither am I) if they're the proper gaskets or not. He's researching on his end, and I promised to ask the board if anyone here knows. I'm not in a position yet to remove the intake manifold and verify myself by sight.

    The end gaskets he has have three alignment bores, if I understood him correctly. The "GM" is definitely on a tab. He mentioned three "metal pins," which I took to be alignment pins that pass through the gasket?

    On my engine, the "GM" tab is present and smack, dab in the middle of the manifold, resting on the block. It was painted along with the engine itself (orange). Smaller than I expected reading the TIMJG. Little bugger. No ridge. I don't see any evidence of alignment pins, but I didn't honestly expect to. If they were there, they'd be interior to the mating surfaces and wouldn't probably be visible on the edge we can see.

    Anyone rebuilt their 454 (maybe even 427) and knows if my (admittedly weak) description is accurate? When Gary talks with his Tonawanda contact, I'll report back what he finds.
    -Kenn
    1970 LS-5
    1970 350/300
    1980 L-48
    2004 LS-1
  • William C.
    NCRS Past President
    • May 31, 1975
    • 6037

    #2
    Re: Intake gaskets, different slant

    The "pins" are actually molded "tits" in the rubber seal that go into the holes in the block to insure alignment. Nothing esoteric. (The things you learn when you build your own drag racing engines in wasting your youth)
    Bill Clupper #618

    Comment

    • Ronald L.
      Extremely Frequent Poster
      • October 18, 2009
      • 3248

      #3
      Re: Intake gaskets, different slant

      Ken,

      I'm surprised Gary did not call me re the BB seals. He knows I know those well.

      The nibs I referenced in the other thread are shown in the attached picture. They fit in the front a rear walls of the block.

      The GM tab is different and only shows in the rear seal as the same seal is used for both and flipped front to rear.

      The 427-454 should be the same, with the nibs or tits with the only difference being the tall deck blocks. I have some if you need a set.

      I would still use a little of the hi-temp RTV black and be sure its not on the outer edges so it does not get squeezed out.
      Attached Files

      Comment

      • Kenn S.
        Very Frequent User
        • September 10, 2009
        • 173

        #4
        Re: Intake gaskets, different slant

        I think I caught him out of the blue. He mentioned he was checking with someone, perhaps it was you.

        Excellent pics, and thank you. I had a verbal description only...got the pins in the wrong piece.

        PM sent. Thx!
        -Kenn
        1970 LS-5
        1970 350/300
        1980 L-48
        2004 LS-1

        Comment

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