Distributor Shaft p/n 1964925. Help. Joe? - NCRS Discussion Boards

Distributor Shaft p/n 1964925. Help. Joe?

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  • Doug C.
    Expired
    • June 30, 2002
    • 88

    Distributor Shaft p/n 1964925. Help. Joe?

    I think p/n 1964925 fits some mid-year small block distributors, not sure which ones. Is there a difference between hi and low HP applications, and if so what is it? Thanks
  • Timothy B.
    Extremely Frequent Poster
    • April 30, 1983
    • 5177

    #2
    Re: Distributor Shaft p/n 1964925. Help. Joe?

    Doug,

    The difference in the distributor main shafts is in the auto cam on the top. This auto cam (along with the springs and weights) determines the centrifugal advance curve for the distributor. The advance curves for different horsepower engines are in tune up manuals. The part # you have here is for 65-66 sp. H/Per W/Hyd Lifters 327.

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    • Harold #43147

      #3
      Re: Distributor Shaft p/n 1964925. Help. Joe?

      Doug Tim is right about different shafts there is a little bushing and a slot that it rides in the distance of the slot will determine the Deg. of mechanical advance.I will weld some material to this slot to retard or make the slot longer to advance. When I tune I will set my initial lead to about 16 Deg. Adv. limit the mechanical 18 Deg Adv gives 34 Deg. Total. I run the Vac. Advance at 6 Deg manifold vac. I set the Mechanical advance weights to be all in at 3400 RPM. This will give more cylinder pressure at off idle makes a big difference in performance.

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