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I'm running Autolite copper plugs, whatever the correct model # is for an Explorer with P heads. I tried Platinum but they fouled quickly with my old style ignition.
 

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Recomended plug for GT-40-P heads = Autolite #104.
Recomended plug for GT-40-Y & X heads = Autolite #764

I have used the #104 for a year on my P heads without a miss.
 

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Re: need help

i have a built 351w thats built to a 363 stroker wanting to put a set of good heads on it its punched .40 0ver flat top pistons e303 cams highvolume oil pump 8 quart oil pan polished heads new valve springs and pushrods lifters ect. and forged crank im trying to get more power out of it and was told from the guy that built the engine if i went aluminum heads and diff lifters and rockers i could get it close to a 408 but im not sure what would be a good head to go with if any
 

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Mustangbuilder - welcome to the Forums. But, your stroker question has nothing to do with GT-40P spark plugs. Please go to the Stroker Engines section and start a new thread. This will get you better answers quicker.

David

Go to the Stroker Engines section and click on New Thread:
 
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