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? timing on a 383?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by HOSS874X4, Jun 26, 2006.

  1. HOSS874X4

    HOSS874X4 1/2 ton status

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    anybody know the timimg on a well built 383 stroker?its chuggs at idle when in gear
     
  2. HOSS874X4

    HOSS874X4 1/2 ton status

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    its got a 650 edelbrok thunder series carb
     
  3. neverendingproject

    neverendingproject 1/2 ton status

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    Advance it till it starts making noise then set it back 6-7 degrees. Call it good.

    Tbi base is set around at 10 btdc so I would work from there.
     
  4. 1977k5

    1977k5 3/4 ton status Vendor

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    What heads, cam, etc.? What is your timing at now?
     
  5. noahrob

    noahrob 1/2 ton status Author

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    I run at about 10 degrees so I can runt aht crappy cheap gas without backfires on decellaration.
     
  6. HOSS874X4

    HOSS874X4 1/2 ton status

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    194 heads ported and polished,mild cam cant remember specs but its not that big i just have it on 8 degrees right now people keep telling me that its between 30 and 40 degrees advanded but that sound to much to me it dynoed at 392 horsepower with flat top pistons should i run premium gas in it its chuggs at idle when in gear but runs perfect at hwy speeds
     
  7. 1977k5

    1977k5 3/4 ton status Vendor

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    Do you run a vacuum advance? Have you checked for vacuum leaks and adjusted the idle mixture? I run 8 degrees initial timing with 24 degrees of mechanical advance with no vacuum advance (for a total of 32 deg.). Yours probably needs more like 35. I kinda doubt your problem is with the timing, especially if you aren't running vacuum advance.
     
  8. HOSS874X4

    HOSS874X4 1/2 ton status

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    yeah i dont have vacuum advance i have 20lbs of vacuum at idle and 10-12 in gear
     
  9. HOSS874X4

    HOSS874X4 1/2 ton status

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    will vacuum advance help it out
     
  10. 1977k5

    1977k5 3/4 ton status Vendor

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    You probably don't want a vacuum advance. Vacuum advance is used to advance timing based on engine load to increase fuel economy but it can be detrimental to a performance motor. When someone tells you that you need 35 degrees of timing, that is a combination of the initial timing and the mechanical advance that the distributor can put out. Set your initial timing at about 8 degrees. My bet is your problem is not timing related.
     

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