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What is ideal timing here?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by CrazeeBush, Feb 26, 2001.

  1. CrazeeBush

    CrazeeBush 1/2 ton status

    Apr 17, 2000
    Likes Received:
    Middle Tennessee
    Okay, I'm prob about to get a bunch of people after me on this one, but I rid my rig of all emmisions equipment, and here's my dilema. I have a 305ci motor. I now have an Edelbrock performer intake and an Edlebrock Performer carb(600 cfm). Yes, I know the Quadrajet is better at steep angles, but I rarely have my truck off road. I have replaced that stupid ESC distributor with a normal HEI unit, and let me tell you the difference is night and day. My question is this, what should be my initial advance? The Mechanical Advance tops out at 14 degrees @ 2200 RPM, Full Vaccum advance is 10 degree. So there is 24 degrees right there. I've heard somewhere that SBC's like 34 degrees, is this correct? Right now timing is set at 8 degrees BTDC. Just wondering what I should set this at. Thanks for your help.

    <A target="_blank" HREF=http://josh.coloradok5.com>http://josh.coloradok5.com</A>
  2. achuskies69

    achuskies69 1/2 ton status

    Jan 7, 2001
    Likes Received:
    Raleigh, NC
    <font color=green> Some of the 350 motors ran better timed around 10 or even 12 degrees BTDC, so with your setup that u have, this may be the trick, just my nickel's worth...

    <font color=green> I love cowboy hats
  3. dyeager535

    dyeager535 1 ton status Premium Member

    Dec 13, 2000
    Likes Received:
    Roy WA
    unless someone comes up with a reason my method does NOT work, then heres what I do:

    Start truck up. Advance distributor a lot. Make sure dist. won't move when you drive it. Go out, find a big hill. Let the engine "bog down" going up it. Floor it. If it pings, pull over, retard timing. Do this until the truck no longer pings under heavy load. (IE the hill) Then turn truck off. If truck still starts easily, then you are done. If it DOESN'T start easily (it will try and ignite the mix as the piston is still coming up, you'll know) then retard the timing until it does. FWIW, vacuum advance is for part throttle, like cruising at a constant throttle opening, which is why it is on a "timed" port in most cases.

    My K5 and Chev/Olds tech/links page: <A target="_blank" HREF=http://www.dorianyeager.com/index2.html>http://www.dorianyeager.com/index2.html</A>

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