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what plug and gap do you run?

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what plug and gap do you run?

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Old

Oct 9, 2011 | 12:41 AM

#1

printmanjackson

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what plug and gap do you run?

I'm running NGK TR55 gapped at 50

Old

Oct 9, 2011 | 01:06 AM

#2

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I just threw in tr55s gapped at .060, first time changing them so I thought I'd just run factory specs

Old

Oct 9, 2011 | 09:10 AM

#3

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TR6 .035 good for 100 shot on spray

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Oct 9, 2011 | 10:11 AM

#4

printmanjackson

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Quote:

Originally Posted by JohnS Z28

I just threw in tr55s gapped at .060, first time changing them so I thought I'd just run factory specs

I always worried about misfire at that gap but it's a bigger spark

Old

Oct 9, 2011 | 10:17 AM

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TR5's gapped @ .040

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Oct 9, 2011 | 02:54 PM

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ACDelco Rapidfire's @ .040, I wanted to run the tr55's since everyone on this site has them and swears by them, but I couldn't bring myself to spend $8 per plug (that's what our store was asking for them) for spark plugs that are going in a car with no heavy mods, just your typical lid and catback. I've put about 1,000 miles on them and they're still doing their job.

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Oct 9, 2011 | 04:43 PM

#7

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out of the box TR6 here. zero issues. going to run TR55 next.

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Old

Oct 9, 2011 | 04:49 PM

#8

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Full bolt on's, stock H/I and a 228/232 cam I run T6s.. Cannot remember the gap though..

That reminds me.. I have 10k miles on these plugs now ( plugs are 3 yrs old) need to get new plugs

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Old

Oct 9, 2011 | 06:42 PM

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TR6's out of the box gap, i can't remember what that is though. No issues.

Old

Oct 9, 2011 | 11:39 PM

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tr6's with factory gap here, .035

switching to br6's when i get my fuel pump in and the nitrous tune put in

Old

Oct 10, 2011 | 06:27 AM

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silverstreak98maro

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TR6 gapped at 45

Old

Oct 10, 2011 | 06:51 AM

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tr55's. gap checked at .055

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Oct 10, 2011 | 08:55 AM

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Denso Iridiums at .040

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Oct 10, 2011 | 09:53 AM

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NGK TR-5 gapped at .055

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Oct 10, 2011 | 10:03 AM

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tr-55 iridium ix gapped@ .055

Old

Oct 10, 2011 | 10:08 AM

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NGK TR-55. I think I gapped them at .050-.055. Make sure you check the gaps on whatever you buy because mine were all kinda off out of the box.

Wasn't there some thread or something from GM talking about the .060 gap being to large? Larger the gap bigger the spark, but its not as consistent as a smaller gap??? hell, idk I read it somewhere.

Old

Oct 10, 2011 | 10:50 AM

#17

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NGK TR-55 gapped at .055

Old

Oct 10, 2011 | 12:54 PM

#18

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ngk tr-6 @ .035" tight gap really helped idle quality with my cam

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Oct 10, 2011 | 01:15 PM

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TR55 at .055

Old

Oct 11, 2011 | 01:37 AM

#20

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Quote:

Originally Posted by JohnS Z28

I just threw in tr55s gapped at .060, first time changing them so I thought I'd just run factory specs

That's not the recommended gap anymore. GM issued a bulletin to cover this. I believe they changed it to .035. I have run TR55s at 60, 55, and 50 with no issues. I am currently running TR5s at 45 or so.

NGK recommends for power increases, gap should be reduced .05 per 50hp over stock. Food for thought.

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