1st track testing of the alum 350 head on this forum

Discussion in 'Small Block Tech' started by partsrparts, May 17, 2021.

  1. sean Buick 76

    sean Buick 76 Buick Nut

    if you want more initial timing without adding extra timing then add a mr gasket bushing to restrict the mechanical advance.
     
  2. Mart

    Mart Gold level member

    Anyone know if a larger than the black, 18 degree bushing, will fit in an MSD billet dist?
     
  3. Fox's Den

    Fox's Den 27 years of racing the same 355 Buick motor

    I do not know if there is a larger bushing for the MSD than the black. thinking about bumping up the initial? then holding back the total. It would make the engine respond quicker out of the hole.
     
  4. Mart

    Mart Gold level member

    ^^ I've used brass hobby tubing over delco pins to do exactly that.:)
     
  5. LARRY70GS

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

    18* is the largest AFAIK. You can lock out the mechanical advance and run constant timing, just need a start retard. Been running that way for many years.
     
  6. partsrparts

    partsrparts Silver Level contributor

    TA dist. has 20 deg. of advance, initial of 16 deg, total 36 all in at 2600 rpm. I have been playing with the timing for a long time and this engine likes 16 deg. initial the best.

    Have not watched to see what the drop is.
     
  7. Mart

    Mart Gold level member

    Larry, does your start retard retard timing when shutting off to prevent run-on?
    My cam likes beacoup initial but I have to leave it in gear to kill it cleanly.
     
  8. LARRY70GS

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

    Yes, the start retard is built into my MSD Part number 6520 Digital 6 ignition box. It pulls 20* of timing while cranking. Once the engine starts and exceeds 800 RPM, it adds the 20* back in. When the engine goes below 500 RPM, it pulls the timing out again.
     
  9. Mart

    Mart Gold level member

    Does that let your eng conk out cleanly idling in Park ?
    My cam likes full timing at idle.:)
    But my idle in park is 1,100.
    In gear it's 850.
     
  10. LARRY70GS

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

    Yes, it shuts off cleanly. I'm at 900 in Park, 750 in gear. Locked out at constant 35* timing, cranks at 15*, 10* vacuum advance.
     
    Last edited: Dec 27, 2021
  11. Buick#455

    Buick#455 Well-Known Member

    LARRY70GS likes this.
  12. Mart

    Mart Gold level member

    That one with the flats probably lets it fit the MSD bushing slot.
    Good find....:)
     
  13. Fox's Den

    Fox's Den 27 years of racing the same 355 Buick motor

    that is a good find might need this myself in the not too distant future.
     

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