69 430 oil pressure in cooling system

Discussion in 'Street/strip 400/430/455' started by Andyshooter, Nov 10, 2019.

  1. Andyshooter

    Andyshooter Member

    This is the original engine for my riv. I only rebuilt it because it had been sitting since 1973. The riv only has 16k on it. Someone had taken the carb off years ago and left the intake wide open. It's a true barn find. It was in a field 6 inches in the mud. The tags on the plate expired in July 73
     
  2. 1969RIVI

    1969RIVI Well-Known Member

    So it's a 69 Riv with the original 430 engine? Like brian said in an earlier post check the casting numbers and make sure they are in fact not 72 and later heads. Maybe somebody back in 73 swapped them for some reason and had the same issues as you're having now, then parked it in the field??
     
    johnriv67 likes this.
  3. Andyshooter

    Andyshooter Member

     

    Attached Files:

  4. Quick Buick

    Quick Buick Arlington Wa

    Looks like 1109 heads. Correct for a 69 but don't quote me
     
  5. 1969RIVI

    1969RIVI Well-Known Member

    Yep 67-69 400/430/455 heads. Here's a chart to help you out in the future.
     

    Attached Files:

  6. BuickV8Mike

    BuickV8Mike SD Buick Fan

    Why were their 3 different 67-69 400 casting numbers used?
     
  7. 1969RIVI

    1969RIVI Well-Known Member

    That answer is beyond my knowledge level, we will wait for the Wizard to explain:)
     
  8. Bens99gtp

    Bens99gtp Well-Known Member

    The later heads would leak coolant into the oil, not the other way around.

    Is it possable for an internal crack in the timing cover cause this........the oil pressure is greater than cooling systems pressure so the fluid would flow that direction
     
    flynbuick likes this.
  9. Andyshooter

    Andyshooter Member

    I agree with the timing cover theory. I have not had the time to pull cover due to my shop being crazy busy . I will try to work it in this coming week. I'm down with the flu this weekend. I appreciate all the imput and will update next week.
     
  10. Andyshooter

    Andyshooter Member

    I finally have an answer and it's not good! I tool off the timing cover and put air pressure through the oil galley. I could immediately hear air inside the passenger side coolant opening. Upon further inspection I found a rusted spot that went directly into the oil passage that feeds the camshaft. Unfortunately it is in a place that cannot be repaired. Looks like I will be looking for a new block. Very disappointed. Thanks to all who have helped me with my crazy issue.
     
  11. 1972Mach1

    1972Mach1 Just some guy.....

    That sucks....there were a few guys with blocks available in this thread: http://v8buick.com/index.php?threads/anybody-got-a-spare-block-laying-around.351862/
     
  12. Electra man

    Electra man Older and Slower

    Sorry to hear that. Best of luck with it.
     
  13. 1969RIVI

    1969RIVI Well-Known Member

    Last edited: Nov 26, 2019
  14. Andyshooter

    Andyshooter Member

  15. Andyshooter

    Andyshooter Member

    Reading that thread it looks like I might be able to go through the oil pressure sender hole and install a sleeve. I will pull the engine and try when it's on the stand. Thanks looking out.
     
  16. 1969RIVI

    1969RIVI Well-Known Member

    No problem at all. Hey it's worth a shot trying to fix it before you scrap it. Maybe try PM'ing Jim Weise and get his thoughts on that repair and if it will work and or hold up to any long duration of time? Even if it lasts long enough to drive the car while you build another engine??
     
    Andyshooter likes this.

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