polskifacet
New member
Picked this thing up. I think I saw someone link it on the EBPF Facebook. I almost want to offer this service to the community for beer money vs paying LMS 
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Precision Spark Plug Gapping
- Thread starter polskifacet
- Start date
looks like a slick little tool to have around. pricey though. honestly this is all i've ever needed. the 542's are spec'd for the 2.7 ecoboost but come pre-gapped at .029( i tightened them up a tiny bit before install)and are still 1 heat range cooler than the 3.5 plugs.polskifacet said:Picked this thing up. I think I saw someone link it on the EBPF Facebook. I almost want to offer this service to the community for beer money vs paying LMS
they also seemed to be indexed so the open part of the ground strap faced the intake port on all 6 plugs. maybe i was just lucky
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Tell me about the 542's?
How do you know they are 1 range cooler? Are you talking about the 534's?
534's are what are in the 2013+ SHO's right?
If the 542's are 1 range cooler than the 534's and pregapped at .029" that would be a great plug because the NGK's that people are using that are cooler than the stockers are not supposed to be closed more than .012" per NGK but people are doing it anyway and possibly risking weakening the ground strap and having if fall in the cylinder
How do you know they are 1 range cooler? Are you talking about the 534's?
534's are what are in the 2013+ SHO's right?
If the 542's are 1 range cooler than the 534's and pregapped at .029" that would be a great plug because the NGK's that people are using that are cooler than the stockers are not supposed to be closed more than .012" per NGK but people are doing it anyway and possibly risking weakening the ground strap and having if fall in the cylinder
the above reasons are exactly why i switched to the 542's. i suppose i'm a little bit ahead of myself claiming first hand knowledge that they're 1 heat range cooler. i've done some research but have never been able to find a direct source that states the heat range of the 542 plugs. however, matt robinson of gearhead auto performance(now tuning 13+ SHOs as well as offering a rebuilt upgraded turbos) states that the 542s are just rebranded ngk 6510s that come pre-gapped and made to run the smaller gap. this makes sense because the 2.7 runs the bigger turbos and higher boost from the factory.AJP turbo said:
i feel they're the best plug option for tuned SHO owners. i just swapped out my 6510s for the 542s a couple weeks ago.
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polskifacet
New member
Ajp would colder plugs benefit my setup?
IMO i don't see any reason not to run a colder plug. . even if you're running meth. it can prevent small amounts of knock/enable a minute amount more timing, and dropping 1 heat range doesn't negatively affect drive ability in any way whatsoever. so better question is why not do it?polskifacet said:
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polskifacet
New member
I went ahead and returned my SP534 plugs. Was going to wait for AJPs input but I'm pulling the trigger on these colder plugs.
polskifacet
New member
All but 1 plug was perfectly gapped to .28. I'm liking this already.
polskifacet
New member
Old Plugs. Actually in good shape for atleast 20k miles.
Generally, the smaller the plug gap, the richer the engine will run, and will cause fouling if not accounted for in the tune. I remember AJP stating numerous times that blowout is not an issue with these engines, so no need to go 0.028. Don't know if methanol helps keep plugs clean like it does the intake tract, so that is another consideration.
The attraction here is mainly the perfect pregap, maybe a colder plug.
The attraction here is mainly the perfect pregap, maybe a colder plug.
gtmorgan23
New member
So I have a new to me 2015 SHO.
I want to know should I go with SP534 gapped at .030 or go with SP542 gapped at .030? The SP542 is one step colder supposedly.
The vehicle has 39k miles and I doubt they have been changed by the previous owner.
I plan to get a tune in the near future. Any advice helps. Thanks.
I want to know should I go with SP534 gapped at .030 or go with SP542 gapped at .030? The SP542 is one step colder supposedly.
The vehicle has 39k miles and I doubt they have been changed by the previous owner.
I plan to get a tune in the near future. Any advice helps. Thanks.
gtmorgan23
New member
I have 39k on it.
Spoke to Livernois and they rec'd the SP542 gapped at .030.
Also have a drop in filter on the way for it as well.
Spoke to Livernois and they rec'd the SP542 gapped at .030.
Also have a drop in filter on the way for it as well.
I usually say to follow your Tuners recommendations!gtmorgan23 said:
I'm assuming your purchasing them directly from LMS correct?
Best of luck. Z
I'm not quite sure which plugs LMS installed on mine. Z :hmmm:
https://www.livernoismotorsports.com/product/LPP630001