C2 throttle base plate ID and gasket info needed - NCRS Discussion Boards

C2 throttle base plate ID and gasket info needed

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  • Kevin B.
    Expired
    • June 30, 2004
    • 36

    C2 throttle base plate ID and gasket info needed

    Hello,

    I have a rather "newbie" question. I am trying to reassemble the Holley 4160 carb back onto the I.M. and want to do it right.
    Here are some details: Holley carb model 4160, List 3367, date code? 2429, GM Intake Manifold casting # 3890490.
    I have the carb reassembled with a Holley renew kit # 37-119. I am stuck at the reattachment of the throttle plate to I.M.
    The "kit" provided doesn't seem to fit the GM I.M, or at least, doesn't match up with the throttle plate gasket I removed when I took the carb off for cleaning. I went back to the Holley Performance website for more information and to look up available gaskets but there is a plethora of different shapes and sizes and none of which resemble the openings in my Intake Manifold. I asked for help at the Holley website but came away more confused without any useful information. Can anyone provide me with what exactly I should put on, including any gasket number(s) for reference? I have pictures of the throttle base plate and I.M. if that helps.
    Numbers off the throttle base plate are 12R-5204B. I cannot make out the mfr. The throttle plate bore dia appears to be 1 9/16" which matches the reference list I found on the Holley Website. Number stamped onto the throttle plate reads either "601" or "109" Also, how do I cross-reference the base plate with numbers like 1850-1,2,3,4,5 etc?
    The summer season is short-lived in my part of the Northeast. I'd like to get the car back on the road as its been >2yrs since I had it on the pavement.
    - Kevin
    Attached Files
  • Jim S.
    Extremely Frequent Poster
    • March 1, 1986
    • 1398

    #2
    Re: C2 throttle base plate ID and gasket info needed

    Kevin ,

    The Gasket you seek looks like this . Sorry It has no numbers on it , and I don't remember where I got it .

    If they are that difficult to find now you could just modify one of the four hole ones .

    Jim


    Update : Just checked Corvette Central :

    CORVETTE HOLLEY CARBURETOR BASE GASKET - 350 OR 365 HP
    Item# 3520621964-1972
    $6.95
    Attached Files

    Comment

    • Kevin B.
      Expired
      • June 30, 2004
      • 36

      #3
      Re: C2 throttle base plate ID and gasket info needed

      Please reference the above pics. I have noticed a gas leak coming from the area of the secondary throttle shaft where the screw for the vacuum secondary diaphram attaches. This area is directly above the divorced / remote choke cover which I have always seen discolored with gas residue. ON occassion I have even seen small puddles on the intake manifold. Yikes! What is the best way to fix this leak. I assume this can also create an air leak as well?

      Comment

      • Joe L.
        Beyond Control Poster
        • February 1, 1988
        • 43211

        #4
        Re: C2 throttle base plate ID and gasket info needed

        Originally posted by Kevin Brooks (42260)
        Please reference the above pics. I have noticed a gas leak coming from the area of the secondary throttle shaft where the screw for the vacuum secondary diaphram attaches. This area is directly above the divorced / remote choke cover which I have always seen discolored with gas residue. ON occassion I have even seen small puddles on the intake manifold. Yikes! What is the best way to fix this leak. I assume this can also create an air leak as well?

        Kevin-------


        If there is a leak at the throttle shaft, then the shaft needs to be re-bushed. This has to be done perfectly, so I'd suggest having an experienced professional do it.
        In Appreciation of John Hinckley

        Comment

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