C2 1967 L71 - NCRS Discussion Boards

C2 1967 L71

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  • Robert K.
    Very Frequent User
    • June 30, 2001
    • 212

    C2 1967 L71

    Would anyone be able to provide me with the following GM part numbers (or know where I could locate the information:

    1) Oil Pump - I believe that is is a 7 digit number starting with 390XXXX.....
    2) Water Pump Pulley -
    3) Harmonic Balancer (crankshaft)
    4) Crankshaft Pulley - is this three grooves or two grooves and is it 1 piece or 2 pieces?
    5) J56 Option - calipers

    Thanks for your help!
  • Joe L.
    Beyond Control Poster
    • February 1, 1988
    • 43193

    #2
    Re: C2 1967 L71

    Bob-----

    1) Oil pump was GM #3904826. Long ago discontinued.

    2) Waterpump pulley was GM #3906656. Discontinued.

    3) Harmonic balancer was GM #3860010. Remains available.

    4) Crankshaft pulley was GM #3863108. This is a 2 groove CAST IRON pulley; no "add-on" pulley was used. Discontinued.

    5) J-56 caliper half part numbers are irrelevant. The part number appears nowhere on the caliper. What does appear on the caliper is the CASTING number for the caliper half. The CASTING numbers for the caliper halves for any given period was the same for standard calipers; only the finishing machining (which affects the not-present-on-the-caliper PART number) differentiates the standard and J-56 calipers.

    Very early 1967 used the 65-66 style calipers. ALL caliper halves will have casting numbers beginning with "546". J-56 fronts will have the end holes for dual pin pads and no center pin boss (both features created by machining of the same castings as used for standard brakes). Most 1967 will have calipers with casting numbers beginning with "545".
    In Appreciation of John Hinckley

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