Join Shelby Forums Today

68 KR ignition timing

Discussion in '1965-1970 Shelby Mustang GT350 & GT500' started by waltweems, Mar 27, 2013.

  1. Mar 27, 2013 #1
    waltweems

    waltweems New Member

    Posts:
    3
    Likes Received:
    0
    Joined:
    Mar 13, 2011
    I had my engine rebuilt last year and now have it back in and running. I set the timing to 10 degree advance with
    the vacuum lines attached and 20 degrees when unattached. all Original including distributor. Car ran great until i hooked up the smog and now it backfires. Anyone have any thoughts? Is the advance OK?

    Thanks,

    Walt Weems
     
    waltweems, Mar 27, 2013
    waltweems, Mar 27, 2013
    #1
  2. Mar 30, 2013 #2
    zrayr

    zrayr Well-Known Member

    Posts:
    446
    Likes Received:
    11
    Joined:
    Oct 30, 2005
    Location:
    TX
    it should be set to the factory spec. with the distributor vacuum line plugged. I think the 10 degree BTDC is the number at idle you should be using.

    Z.
     
    zrayr, Mar 30, 2013
    zrayr, Mar 30, 2013
    #2
  3. Apr 6, 2013 #3
    waltweems

    waltweems New Member

    Posts:
    3
    Likes Received:
    0
    Joined:
    Mar 13, 2011
    I have my timing set for 10 degree advance and the car does run well but, when I connect the smog pump
    it backfires. Any thoughts on the backfire issue?

    Thanks,

    Walt Weems
     
    waltweems, Apr 6, 2013
    waltweems, Apr 6, 2013
    #3

Share This Page