<VV> Dieseling !

[Secular]

  What causes dieseling or post ignition and how can it be tamed? - cooler plugs, advancing/retarding the timing, or .... ? 

  My 65 - 140 HP has two brand-new Holley 5200 carburetors. The car's idles smoothly & is NOT set too high (it idles @ 700 rpm), yet I am experiencing dieseling almost all the time when I turn off the engine.

  The timing is set at 16 BTDC. 

  Could it be carbon deposits? a friend suggested Chevron TECHRON!

  Regards,


  Tony