i was running autolite #25 in my castiron heads
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i was running autolite #25 in my castiron heads

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    Default i was running autolite #25 in my castiron heads

    now i have afr aluminum heads and they said to run an autolite 3932 not sure if thats a colder plug was curious what you guys think 468 bbc tunnel ram with with 750s 10/1 compression msd 6 running 93 octance timing at 32 degrees

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    Senior Member jetboatperformance's Avatar
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    good starting point , read um and see what they say

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    Quote Originally Posted by jetboatperformance View Post
    good starting point , read um and see what they say
    ok thanx i allways liked ngk better but not sure what they be ?

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    Senior Member jetboatperformance's Avatar
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    Quote Originally Posted by duty View Post
    ok thanx i allways liked ngk better but not sure what they be ?

    There are a lot of NGK "equivalents" to choose from Autolite 26 - Alternative spark plugs

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    IMO...you might find autolite has a bit bigger selection of ranges. If you can find a "real" parts store w/a paper cataloge...check the buyers guide/heat range chart in the back. Also...don't forget, sometime you can use 5/8" hex plugs in place of 13/16"...space permitting. We did a lot of this in my dirt-track days.

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    Default spark plugs

    Quote Originally Posted by duty View Post
    now i have afr aluminum heads and they said to run an autolite 3932 not sure if thats a colder plug was curious what you guys think 468 bbc tunnel ram with with 750s 10/1 compression msd 6 running 93 octance timing at 32 degrees
    Correct me if I m wrong an Autolite 25 a short reach hot plug and a 3932 is a long reach racing plug very cold, make sure you are installing the right plugs

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    Quote Originally Posted by greg shoemaker View Post
    Correct me if I m wrong an Autolite 25 a short reach hot plug and a 3932 is a long reach racing plug very cold, make sure you are installing the right plugs
    thats what the guys at afr said to start off with ...........

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