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  1. #1

    Default 351w Spark Plugs

    Hi
    I am running a set of worked 351W heads that have 13/16 (18mm) spark plugs. I have autolight AP 45 plugs,
    an wonder if there is a better plug to use.
    Thanks,
    Ed

  2. #2
    FEP Power Member Jerry peachuer's Avatar
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    Hi How worked are the heads? Still pump gas compression ?

  3. #3
    FEP Power Member richpet's Avatar
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    Best thing would probably be to 'read' them after being run. That can help you decide if the heat range is correct, etc.
    83 5.0 GT. Quicker than it looks! 10:1 (or just over) 306, Motorsport a332 cam, 140A alt, t5 conv, 8.8 w/ 3.27's, Edel rpm, alum rad, very worked e7's, Holley SA carb, etc... SOLD IT!!!!

    Now an 1981 Granada! .040 over 302, Edel E-street heads... Currently building a 347 because, why not?

    "Never underestimate the power of stupid people in large groups"

  4. #4
    FEP Super Member xctasy's Avatar
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    Depending on the type of 302 or 351w head you are using, from 1974 or up they switched from the 18 mm larger plug to the small 14 mm ones.

    Although it has to be pegged, there is an adaptor the FE and Log head 3.3 guys use.

    https://brillman.com/product/spark-p...-18mm-to-14mm/

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