50 psi at idle on rebuilt 350 with high volume pump????

Discussion in 'The Garage' started by down4thakrown, Jul 26, 2005.

  1. down4thakrown

    down4thakrown 1/2 ton status Premium Member GMOTM Winner

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    the psi's go up with the revs as in : 50psi at 1-2000 rpms, 75psi at 3000rpms, bout 80-85 at 4000. could there be air in the line?? or is this normal when haveing a 274 lift/duration cam??
     
  2. pauly383

    pauly383 Daddy383 Staff Member Moderator

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    I have heard 10 psi for every 1000 rpm is fine . 50 psi at idle sounds good to me . My engine does 50-60 at idle with 140,000 some odd miles on the bottom end . Now , later model trucks have an 80 psi gauge , got one for mine off a later second gen . I haven't changed to the 80 psi sender yet .

    With the 60 psi gauge and sender , it did peg it driving .
     
  3. Emmettology 101

    Emmettology 101 3/4 ton status Premium Member

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    Not sure what pump is in my 383. But at idle my factory 60psi gauge is pegged.
     
  4. RootBreaker

    RootBreaker 3/4 ton status Premium Member GMOTM Winner

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    ive got a 1991 caprice police 350 (crappy motor) and it pegs at idle.... 60psi gauge isnt good enough :haha:
     
  5. CyberSniper

    CyberSniper 1/2 ton status

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    20-30 at idle is all you need. 35-40 at 2,000 rpm. 60-65 at 6,000rpm.

    Anything more than that and you're just increasing pump wear, distributor shaft wear, distributor gear wear, cam gear wear, and increasing parisitic losses.

    The pump should've come with a 70psi relief valve in it.
     
  6. Mad-Dog

    Mad-Dog 1/2 ton status

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    Gee..........i hope you installed a deep-sump pan with that high-volume pump that will suck a 5 qt. pan dry at high rpm's.. :crazy:
     

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