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Hot Rods Oil pressure ???

Discussion in 'The Hokey Ass Message Board' started by dogwalkin, Apr 11, 2025.

  1. dogwalkin
    Joined: Jan 17, 2013
    Posts: 169

    dogwalkin
    Member
    from tn

    Hey guys can I get yalls expert opinion on something?? I've got a pontiac 350 in my '50 pontiac. I put new rings, rod bearings , main bearings and cam bearings in. Just kinda a cheap overhaul. New oil pump and gaskets as well. It runs great. No noises and runs smooth. The question is. It has about 30lb oil pressure at idle cold. About 10 at idle hot. It goes up nice and. Smooth as soon as you rev it. I have a 700r4 in the car so it cruises as about 1900 rpm on the highway with 30-35 lbs of oil pressure. Does this sound ok to yall?

    I guess my concern is the kinda low idle pressure. Thanks in advance guys.
     
    tractorguy likes this.
  2. BJR
    Joined: Mar 11, 2005
    Posts: 10,825

    BJR
    Member

    Sounds fine to me.
     
    tractorguy and squirrel like this.
  3. partsdawg
    Joined: Feb 12, 2006
    Posts: 3,735

    partsdawg
    ALLIANCE MEMBER
    from Minnesota

  4. dogwalkin
    Joined: Jan 17, 2013
    Posts: 169

    dogwalkin
    Member
    from tn

    Yall my heroes! Thanks
     
  5. deucemac
    Joined: Aug 31, 2008
    Posts: 1,603

    deucemac
    Member

    Rule of thumb is 10 psi per 1000 rpm minimum
     
  6. Joe H
    Joined: Feb 10, 2008
    Posts: 1,717

    Joe H
    Member

    In 1965, Pontiac's used a low oil pressure light when the pressure got to low, the sensor was set to turn on the light at 3 to 4 psi of pressure.
     
    dogwalkin and tractorguy like this.
  7.  
    dogwalkin likes this.
  8. Wanderlust
    Joined: Oct 27, 2019
    Posts: 925

    Wanderlust

    Oil FLOW is important, pressure is just how much isn’t able to flow, excess pressure is just wasting horsepower
     
    dogwalkin, MCjim and tubman like this.
  9. gimpyshotrods
    Joined: May 20, 2009
    Posts: 24,201

    gimpyshotrods
    ALLIANCE MEMBER

    Try a different gauge.
     
  10. dogwalkin
    Joined: Jan 17, 2013
    Posts: 169

    dogwalkin
    Member
    from tn

    I have tried a couple of different guages. Same result both times.
     
  11. Joe H
    Joined: Feb 10, 2008
    Posts: 1,717

    Joe H
    Member

    What oil is in it and how old is it? Did always do this or has something changed?
    Could be oil pump, loose lifter bores, loose bearings, leaking oil galley plug...... would need to tear into to know for sure.
     
  12. RodStRace
    Joined: Dec 7, 2007
    Posts: 6,847

    RodStRace
    Member

    It should be good to go. You can try different weight oils if it's so worrying that you don't drive it, but as said, 10 PSI per 1000 RPM has been a rule for decades.
    Chasing the issue is going to consume time and money with little to no benefit, so long as the bearings have proper clearance.
     

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