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The most Ive seen a stock 4.6L gapped at is .60
I would stay in the fords recommended gapping of
.52 to .56

Personally I run .54 I figured Im right between specs.

Some people say gap on the low side, so over time even when your
plugs are used they will burn in range. But I change my plugs
often and never let them go that long.

I would think too large of gap is not good with
a stock ignition.

Guy's with upgraded ignitions may be able to run a larger gap
because they have the voltage to jump it.

But even so our stock ignition is good and many people
on here including me stick with the factory ignition
and coils over the aftermarket.

Ive heard more horror stories over the MSD and Accell parts
for the 4.6L and dont even dare to try it.
But thats my opinion.

Steve 4.6L
 

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Fry Rice Specialist
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4,794 Posts
mine gapping at .058 and still running strong on stock coil packs. 167k miles coil pack.
 

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Refrigerator Raider Hater
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I gapped mine at .060 with stock coils and factory wires with 90K miles on them, ran better than ever.
 

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did they put really good wires in alpine green cars or something greenbird? Both of our wires have 90k on them, and still are good, although i just ordered a set of moroso spiral core wires for the 96-98 mustang, but they work for our cars.
 

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GreenBird said:
I gapped mine at .060 with stock coils and factory wires with 90K miles on them, ran better than ever.
And you will be crying when your muffler bearings go out in a few thousand miles!!! ;) I run 0.054" for those who care. I decided to stay in spec just for the hell of it. Zero problems as yet. On my next set of plugs, I might try 0.060.
-Rob
 

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Refrigerator Raider Hater
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wilson502 said:
did they put really good wires in alpine green cars or something greenbird? Both of our wires have 90k on them, and still are good, although i just ordered a set of moroso spiral core wires for the 96-98 mustang, but they work for our cars.
I dunno. I know my car has always been storage in winter. It can't be because I baby it, because I definately don't!

I'm at almost 94K now, I changed the wires because I could see arching at high revs, even through I never had the engine miss. Didn't notice an improvement either so they must have life left in them.

Rob said:


And you will be crying when your muffler bearings go out in a few thousand miles!!! ;) I run 0.054" for those who care. I decided to stay in spec just for the hell of it. Zero problems as yet. On my next set of plugs, I might try 0.060.
-Rob
My mufflers don't need bearings since they have no chambers. :tongue:
 

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i do mine .058 i dont think the gap makes a diff, untill the point when the car misses

so i think .054 would be fine, i doubt theres gains to be had with opening up the gap
 

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Moderator, Iowa Chapter Director, Uber Luber, TCCo
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the larger the gap, the harder it is to spark, and the hotter the spark is.
 

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GreenBird said:
My mufflers don't need bearings since they have no chambers. :tongue:
No chambers represent!!! What kinda mufflers do you use? I'm so glad I replaced my flowmasters with the magnaflows. The bearing replacement intervals were too close together for the 50 series.
-Rob
 
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