Unpleasant surprise in 50 year old pan!

Discussion in 'Small Block Tech' started by 69WILD, Nov 5, 2021.

  1. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

    69WILD and Dano like this.
  2. sean Buick 76

    sean Buick 76 Buick Nut

    I would try 2 different things:

    switch to a different carb

    remove the timing cover and degree the cam
     
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  3. Mart

    Mart Gold level member

    I don't think colder heat range plugs will stop the detonation you have going....
    A real fat/rich carb with correct cam degree.

    Go from there....

    Those plug electrode pics look dry like aluminum. :eek:
     
  4. Jim Nichols

    Jim Nichols Well-Known Member

    I think it may help to retard the cam timing.
     
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  5. 69WILD

    69WILD Ron

    Ok. .....I retarded timing again to only a slight ping. Repaired a small vacuum leak, disconnected advance. All in at 20* now. Idle below -1 degree.
     
  6. Buick#455

    Buick#455 Well-Known Member

    You need to degree that cam properly, if not your going to keep chasing this rabbit down the same hole.
    1. Put some race gas in, see where you are at....
    2. Try a different carb, you may be tooo lean.
    3. Degree the cam properly
    That's the order I would go, but honestly you should have properly degree that cam in the first place. Good luck, hope you get it sorted out
     
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  7. 69WILD

    69WILD Ron

    Octane booster seemed to help this evening.
     
  8. 69WILD

    69WILD Ron

    I've been reading about the procedure for degreeing the cam.

    http://www.lunatipower.com/Tech/Default.aspx

    Seems like it would be possible to just check it without removing timing cover and head? Wouldn't there be a way to bolt the wheel to the crank pulley to just get a rough idea?
     
  9. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

    I think I read somewhere that there is a way to determine if it is in the ball park. JW posted it. Let me see if I can find it.
     
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  10. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

  11. 69WILD

    69WILD Ron

    I'm thinking just a cheap degree wheel.

    PCE by Speedmaster PCE398.1001 10" Universal Pressed Steel Camshaft Timing Degree Wheel https://a.co/d/cyJe6bA
     
  12. 69WILD

    69WILD Ron

    Wow that's great knowledge! Thanks so much Larry and Jim! I'll keep you posted
     
  13. 69WILD

    69WILD Ron

    I do have access to a magnet dial indicator. I'm thinking i could use it to get close to exact "split overlap" ......somehow.
     
  14. 69WILD

    69WILD Ron

    Looks exactly right to me with just eyeballing it
     

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  15. 69WILD

    69WILD Ron

    Had my wife eyeballing it also. Came up with 0* again almost exactly
     

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  16. 69WILD

    69WILD Ron

    Should do it with a dial indicator gauge i guess
     

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  17. 69WILD

    69WILD Ron

    And rocker arms off
     
  18. 69WILD

    69WILD Ron

    I just finished measuring split overlap and timing is retarded. The timing mark lines up exactly with the hole in the motor timing gauge.
     

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  19. 69WILD

    69WILD Ron

    I guess next step is to get a degree wheel to confirm. My timing set allows adjustment of the crankshaft timing by ± 4°.
     
  20. 69WILD

    69WILD Ron

    How far retarded is the hole in the engine timing indicator gauge? 6* maybe??
     

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    Last edited: Aug 12, 2022

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