Valve spring pocket

Discussion in 'Street/strip 400/430/455' started by 87GN_70GS, Sep 16, 2003.

  1. 87GN_70GS

    87GN_70GS Well-Known Member

    Can the Pontiac sized springs (1.385" O.D.) be used on a stock BBB head without machining the spring pocket? What is the diameter of the stock spring pocket? TIA.
     
    87GN_70GS, Sep 16, 2003
    #1
  2. 87GN_70GS

    87GN_70GS Well-Known Member

    ???
     
    87GN_70GS, Sep 18, 2003
    #2
  3. buick535

    buick535 Well-Known Member


    The 1.38 od is fine, what about the inside diameter?
    Why are you wanting to use pontiac springs? If memory serves me correctly, they have a shorter installed height than the Buick springs. Jim Burek P.A.E. ENTERPRISES
     
    buick535, Sep 19, 2003
    #3
  4. Buickus Rex

    Buickus Rex '67 GS400 4-Speed

    Re: Re: Valve spring pocket

    You are correct Jim.

    The Pontiac installed spring height is typically in the range of 1.53" - 1.59", depending on year and engine option. The closest one that I know of is the '70 Ram Air 400" motor, with an installed height of 1.818"...still too short. Buick spring height is about 1.89".

    Larry
     
    Buickus Rex, Sep 20, 2003
    #4

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