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Old 09-08-2012, 11:24 AM   #161
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Originally Posted by boosted150

Does anyone know if the Ford plugs are iridium? When I pulled mine, it looked like they were iridium, but I could be wrong. If they are, I am pretty impressed that Ford would do that from the factory.
Not sure myself on the iridium, someone will tune in though.
How were the gaps on yours?
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Old 09-08-2012, 02:09 PM   #162
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Yes, iridium, made by ngk. Same as their "OEM" line. Cheeper version of what they normally sale at the local parts store.

Last edited by CoreyMS; 09-08-2012 at 06:36 PM.
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Old 09-10-2012, 08:01 AM   #163
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Old 09-10-2012, 09:20 AM   #164
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Re-gaped my OEM plugs this weekend. Yes they are iridium plugs. All of mine were gaped between .040-.042. I set them all to .035.

It seems like it runs better, but I can't really tell since it was a perfect 55F outside this morning.
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Old 09-10-2012, 08:03 PM   #165
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I re-gapped mine to 0.030" and the truck runs better all together. It idles smoother and hasn't had any miss/shudders at all. At 31,000 miles of mostly being "tuned" (95% of the time) the plugs look awesome, no sign of anything unhappy going on in the cylinders that I could tell.
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Old 09-10-2012, 08:50 PM   #166
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35 38 38 37 38 39 . swapped to 6510s at 35. idles smoother, accelerates with no hesitations mid rev. will see how mileage suffers.

all my plugs were GROSSLY over torqued from the factory. nearly twice the factory torque specs on one of them.
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Old 09-10-2012, 10:09 PM   #167
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Quote:
Originally Posted by jcain
35 38 38 37 38 39 . swapped to 6510s at 35. idles smoother, accelerates with no hesitations mid rev. will see how mileage suffers.

all my plugs were GROSSLY over torqued from the factory. nearly twice the factory torque specs on one of them.
Which ones were the 6510s again? I did the autolite xp5364 (one step colder) @ .32 this time (torrie said .30 on the stocks for his 93 big tune but I'm testing)...got 21.5 MPG on the hour to the track Saturday and then ran a 13.947. I don't think the one step colder is hurting a thing. We'll see how the mileage does after some longer trips, but I usually run a less aggressive tune day to day, usually the 5star 93 perf/tow. Before and after plug swaps my average is 19.3 with that tune normal driving...

Last edited by CoreyMS; 09-10-2012 at 10:14 PM.
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Old 09-10-2012, 10:13 PM   #168
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Quote:
Originally Posted by CoreyMS

Which ones were the 6510s again? I did the autolite xp5364 (one step colder) @ .32 this time (torrie said .30 on the stocks for his 93 big tune but I'm testing)...got 21.5 MPG on the hour to the track Saturday and then ran a 13.947. I don't think the one step colder is hurting a thing. We'll see how the mileage does after some longer trips, but I usually run a less aggressive tune day to day, usually the 5star 93 perf/tow. Before and after plug swaps my average is 19.3 with that tune normal driving...
Ngks one step colder iridium
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Old 09-10-2012, 10:14 PM   #169
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J, what did they come gapped to, in the box?
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Old 09-10-2012, 10:17 PM   #170
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Quote:
Originally Posted by CoreyMS
J, what did they come gapped to, in the box?
38ish
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