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Will a 6 to 12 volt swap increase stock plug gap?

Discussion in 'The Hokey Ass Message Board' started by StuntmanJames, Oct 27, 2011.

  1. StuntmanJames
    Joined: Aug 22, 2009
    Posts: 171

    from Denton Tx

    I recently gave my '55 Desoto a mild tuneup with a very much needed oil change and new plugs... I was told by previous owner that they came stock 6 volts, but shes been swapped 12 now. She has a stock 291 Firedome Hemi and in my shop manual for her it says the gap is .035. She running better then ever but is that too small of a gap? Thanx for any help! :)
  2. I used the stock gap on my 12v conversion.
    Works like it should.
  3. ugotpk
    Joined: Nov 3, 2008
    Posts: 503


    THe only time you should increase gap is if you have a CDI. If you are still running points. Keep the gap at 32 - 35 You should also use a matching capacitor

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