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  1. #1

    Default Spark plug gap for gt40 heads(non p)

    Hey wassup everybody quick question. I have a 1985 mustang gt 5.0H.O carbed... I threw some gt40 3bar heads on it with a trickflow stage 1 cam not sure what spark plug gap to use .44 or .54. Not sure what year they're from they dont have thermactor ports so I'm assuming 97 explorer or mountaineer the casting number is F3ZE-AA and I'm using motocraft sp-413 plugs

  2. #2
    FEP Super Member bwguardian's Avatar
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    Those are 1993 Cobra heads...and I would say .44 to .50 on the gap.

    https://lmr.com/products/79-93-fox-b...plug-gap-specs
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  3. #3

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    Oh wow i was reading elsewhere that the smog was different on the mountaineer and explorer Hence the lace of thermactor ports... And do. 44 to. 60 should i do like. 46 or how would i best calculate?

    Quote Originally Posted by bwguardian View Post
    Those are 1993 Cobra heads...and I would say .44 to .50 on the gap.

    https://lmr.com/products/79-93-fox-b...plug-gap-specs

  4. #4
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    qikgts's Avatar
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    Pretty sure this is correct.

    1993 Cobra Plugs:
    Platinum Plugs: AWSF32P or SP493
    Copper Plugs: AWSF32C or SP447
    Gap @ .054"
    '85 GT

  5. #5

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    SP447s on my GT40 3 bar heads. Thermactor ports plugged in the back. Gapped at .050" but I believe qikgts is correct on the factory specs.
    05 Corvette Z51

  6. #6

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    They didn't have cooper in stock so i got nickel sp413

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