Register now to get rid of these ads!

327 timing hei regapped plugs

Discussion in 'The Hokey Ass Message Board' started by larry woods, Jan 15, 2011.

  1. larry woods
    Joined: Jan 20, 2010
    Posts: 566

    larry woods
    from venice fl

    so i read the thread a few weeks ago re regapping plugs w/ hei. when i got home i regapped the plugs in my 327 to .045 and now have developed skip underload. i am having an old fart moment. what do i need to do with timing and regapped plugs. at first hought it was crappy gas from sitting too long but at this point? thanx larry
  2. gladeparkflyer
    Joined: Jun 16, 2009
    Posts: 396


    my 1st thought would be if thats all you changed, go back to your initial gap and see if the problem goes away...
  3. burnout2614
    Joined: Sep 21, 2009
    Posts: 612


    How long has it been sitting with that gas? If you are already running lean, opening up the gap MAY make it skip but unlikely. If the gas is over 3 months old swap it. How much timing are you running? peace
  4. troylee
    Joined: Jul 10, 2007
    Posts: 683


    I always use the .045 for electronic and .035 for point rule. May be the carb or something in the distributor?
    Register now to get rid of these ads!

  5. Toymaker
    Joined: Mar 26, 2006
    Posts: 3,920

    from Fresno,CA

    If you regapped old plugs your "Spark" could now be traveling up the insulator around the electrode due to carbon, oil build up etc. and causing a stumble under load. By increasing the gap you have now increase the resistance for your spark to make the jump across the gap under a load. If plugs are new check other areas like wires, cap, rotor etc.
  6. 55 gasser pickup
    Joined: Dec 17, 2010
    Posts: 479

    55 gasser pickup
    from utah

    check the easy stuff first.Once i didn't put a wire on a plug all the way and it didn't miss all the time but it would skip every so often when idoling.Stupid but hey it happends
  7. mt shasta steve
    Joined: Mar 26, 2010
    Posts: 270

    mt shasta steve

    Both my cars have HEI, and when I checked, both had .035 gap. Cleaned plugs and reset gap to .045 and noticed an immediate smoother idle. And better pull under acceleration. A "skip" won't be caused by plug gap. As has been mentioned, I would look for a bad wire, bad plug, or bad connection.
  8. Badhabit
    Joined: Nov 5, 2009
    Posts: 86


    Toymaker has it right, I think the resistance has increased causing spark leak. Even though you notice it under load, try running the car with the hood open in a very dark garage. Look for spark jumping. If you have an automatic, have someone brake torque it in gear to create a load. I've run HEI plug gaps at .060, some have run at .080 with a CD box. You are running your HEI at 12 volts, right?

  9. Used HEI stock GM? .045 is too much, go back to about .040 and drive it again.

    You time it the same way you would if you had points.
    Joined: Jun 15, 2006
    Posts: 3,359


    Some wild answers here for sure.

    Plug gap goes with combustion chamber and engine design NOT the ignition system. A 327 needs .035 not the .045, the 045 just askes for increased energy thats not needed with the combustion design.
    Longer burn times were mandated by lean air fuel ratios, most hot rods are not lean for sure...
  11. gearheadbill
    Joined: Oct 11, 2002
    Posts: 1,301


    Listen to Bubba....Bubba knows!!
  12. carcrazyjohn
    Joined: Apr 16, 2008
    Posts: 4,844

    from trevose pa

    18436572 and also redo the timing . I would set it at 45 ,

Share This Page

Register now to get rid of these ads!


Copyright © 1995-2020 The Jalopy Journal: Steal our stuff, we'll kick your teeth in. Terms of Service. Privacy Policy.

Atomic Industry
Forum software by XenForo™ ©2010-2014 XenForo Ltd.