I just put on a set of gt40p heads with the stock cam on my 88gt and I was wondering what I should set the gap on my plugs at.
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spark plug gap
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My gap is set at .050 and my timing is at 14 degrees but the doesn't feel much faster since I did the heads. It has no low end torque but I can feel the difference once it gets to 3000 rpms.
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My GT40X's take different plugs. I believe the P heads do as well. I'd sure like to know what to set mine at as well I kind of just put them in
The e7 and gt40p plugs are not interchangeable the width is different. Something else haqs to be my problem.
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What other supporting mods did you do? You just slap on the heads?
GT-40P's take the same plug as the 1993 cobra. Gap is 0.052-0.056" on 86+ Mustangs (Naturally aspirated)
GT-40P's take the same plug as the 1993 cobra. Gap is 0.052-0.056" on 86+ Mustangs (Naturally aspirated)
Gap is more or less dictacted by the ignition system and not the head really.
Stock igntion is good for 0.052-0.056". On some older system,s some will find the engine runs better closed up a bit. With aftermarket ignitions, you might be able to go larger N/A.
Depends on each car really. I say start with 0.054" and adjust from there. A lot of guys like to run around 0.045" gap. A lot of text incorrectly state this as the factory gap. The true factory gap on 86+ 5.0's is in fact 0.052-0.056".
Stock igntion is good for 0.052-0.056". On some older system,s some will find the engine runs better closed up a bit. With aftermarket ignitions, you might be able to go larger N/A.
Depends on each car really. I say start with 0.054" and adjust from there. A lot of guys like to run around 0.045" gap. A lot of text incorrectly state this as the factory gap. The true factory gap on 86+ 5.0's is in fact 0.052-0.056".
I know I'm just messin with ya 
I think you need to run it down the drag strip and THEN make up your mind.
I think you need to run it down the drag strip and THEN make up your mind.
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