oil system mods that help

Discussion in 'Oil and Lube Systems' started by grumpyvette, Sep 29, 2009.

  1. 87vette81big

    87vette81big Guest

    Without a Doubt in my mind the Bypass Valve is open 100% of the time in a Pontiac V8 with The stock oil pump, M54D & M54F 40-60-80psi oil pumps respective when on the gas WOT ABOVE 2600RPMS.

    opening and smoothing the recessed area and porting the oil passage entrance reduces the restriction to oil flow
    [​IMG] [​IMG]
    notice the open slot between the rear main cap supporting the oil pump and bearing shell support and the area supporting the rear main seal, this prevents PRESSURIZED oil from the bearings reaching the rear main seal.
    the as cast recess in the rear main cap where the oil pump mounts can be rather restrictive and shallow
    Last edited by a moderator: Oct 10, 2017
  2. Strictly Attitude

    Strictly Attitude solid fixture here in the forum

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