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  1. #1

    Default Timing - Advance or Retard to stop knock?

    I've noticed it as the temps heating up here in Tx. Don't know if it has anything to do with it, but I was wondering if I should mess with the timing to keep it from knocking when I accelerate? When I'm on the the hwy, if I accelerate, it'll knock. I can press the pedal more or back off of it and it quits. Usually around 60 - 65. No vacuum leaks, plugs are good, wires good...all that good stuff. It is carborated so maybe I should lean it up a little? Too many options and no clue where to start. Don't want to do anything if it's not going to make a difference.

    Chevy 350, stock, Holley 600...

    Thanks for the inputs!!!
    TNT - Texas

    First - '68 longbed (lady runs stop sign, insurance gives me a check)
    Then - '81 SWB (stupid stupid stupid...sold it thinking I was going to get something else)
    Now - Finally got my '86 (350, Holley 600, 700r4)

  2. #2

    Join Date
    Jun 2006
    River Ridge Louisiana-4 miles W of New Orleans-didn't flood-water stopped 800 yards away.


    In general you would want to richen it up, and or retard the timing.

    Real life I would use 93 octane, if you don't already.

    1)Use 93 octane-this should do it, if it hasn't already.
    2)Retard the timing a few degrees-3 or so- so it has less advance-for example firing at 15 degrees before instead of 18 degrees before TDC
    3)Go up one on the pilot jet-Holley's have pilot jets and main jets right?

    4)Don't lug the motor-keep it in a lower gear than you really need-stay in 1st longer, 2nd longer etc.

    Do you have a higher than stock compression motor?

    1998 suburban-
    1/2 ton

    199500 miles

  3. #3
    Master Mechanic Silverado Junkie's Avatar
    Join Date
    Feb 2010
    Lead Hill, Arkansas


    Hes right, reduce timing to reduce knocking. Thats what knock sensors in newer vehicles do, when knocking is detected they reduce timing.
    1995 Silverado,Z71, 3-inch lift,2-inch leveling kit, SkyJacker Suspension, short ram-air intake, throttle body spacer, MSD ignition coil, straight pipes

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