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Thread: Dual-Plug Heads?

  1. #11
    Join Date
    Jun 2001
    Central Illinois, USA


    Quote Originally Posted by ryan View Post
    For the short reach plug, do you use a 3/8" or 1/2" reach plug? Also you can buy sparkplug indexing washers. Why not kill 2 birds with one stone and index your long reach plugs while spacing them out a thread or two at the same time. Just my 2 cents.
    Yeah John...

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  2. #12


    I used 1/2" reach on the right side and 3/4" reach on left side. You can weld up the head to use the 3/4" reach on the right side so all 4 spark plugs are the same reach. I ended up doing this to my 74 cu. in. FXE.

  3. #13


    I forgot to mention, later shovel heads on the 80 cu. in. were thicker and could use 3/4" reach plugs on both sides when they were drilled.

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