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Old 10-13-2015, 02:45 PM   #1
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Tr-55s in our camed LS3s

Some shops mentioned putting NGK tr-55s in our engines with upgraded cams but these plugs come gaped at .059. Are these correct for our applications.
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Old 10-13-2015, 06:51 PM   #2
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Yes they are the most commonly used some use slightly different, it is the heat range change..... And you want IX for iridium like stock

http://www.ngk.com/product.aspx?zpid=10165 And these I think were close to the .060 I thought , regap as needed. Also many use the tr6ix too.
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Old 10-13-2015, 07:53 PM   #3
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Quote:
Originally Posted by christianchevell View Post
Yes they are the most commonly used some use slightly different, it is the heat range change..... And you want IX for iridium like stock

http://www.ngk.com/product.aspx?zpid=10165 And these I think were close to the .040 I thought , regap as needed. Also many use the tr6ix too.
I am cammed. Was told to use the copper NGKs for stronger burn.
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Old 10-14-2015, 09:12 AM   #4
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Because of the weight of the 5th Gen, and depending on your application I sometimes take a step back in heat range on these cams. It tends to yield better results in the timing department with less detonation & ability to run more timing. The TR55 has been the go-to for LSX engines for almost 20 years, but that heat range was also widely used back when cars weighed 3500lbs, not 4200lbs. If your setup is on a tight lobe separation or running more compression than stock I'd consider dropping to the TR6.
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Old 10-14-2015, 09:26 AM   #5
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I use TR6
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Old 10-14-2015, 09:34 AM   #6
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TR6 here gapped at .040 or .045 can't remember
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Old 10-14-2015, 09:43 AM   #7
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Quote:
Originally Posted by Josh @ Spartan LSX View Post
Because of the weight of the 5th Gen, and depending on your application I sometimes take a step back in heat range on these cams. It tends to yield better results in the timing department with less detonation & ability to run more timing. The TR55 has been the go-to for LSX engines for almost 20 years, but that heat range was also widely used back when cars weighed 3500lbs, not 4200lbs. If your setup is on a tight lobe separation or running more compression than stock I'd consider dropping to the TR6.
But at .059 gap, isn't that too wide for our applications?
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Old 10-14-2015, 01:14 PM   #8
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TR6 here gapped at .040 or .045 can't remember
Ditto. Gap was also .040 or .045 but cant remember
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Old 10-14-2015, 01:32 PM   #9
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What's wrong with stock ac delco plugs? I can see the need for different plugs for boosted or super high compression applications, but not really for simply cammed engines.
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Old 10-14-2015, 05:53 PM   #10
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What's wrong with stock ac delco plugs? I can see the need for different plugs for boosted or super high compression applications, but not really for simply cammed engines.
cammed engines that see track. And speaking of AC Delco plugs, they always perform with more torque than NGKs.

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Old 10-15-2015, 09:00 PM   #11
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TR55s are the same heat range as the TR5, just with a larger out of the box gap. They were originally intended for the early cars and trucks that specified a larger spark gap from the factory. GM revised the spark plug gap spec in later years, making the TR5 the stock replacement and the TR6 one heat range colder.
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Old 10-15-2015, 10:43 PM   #12
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TR55s are the same heat range as the TR5, just with a larger out of the box gap. They were originally intended for the early cars and trucks that specified a larger spark gap from the factory. GM revised the spark plug gap spec in later years, making the TR5 the stock replacement and the TR6 one heat range colder.
I have TR-5s in my block at the moment, measured at .038 actually. Stock is around .044.
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Old 10-15-2015, 10:50 PM   #13
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But at .059 gap, isn't that too wide for our applications?
Plug gap can be adjusted with a simple $2 tool from autozone. The gap that they come with is not what you have to use.
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Old 10-15-2015, 11:20 PM   #14
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Plug gap can be adjusted with a simple $2 tool from autozone. The gap that they come with is not what you have to use.
You're not supposed to re gap iridium tipped plugs. It can ruin them.
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Old 10-15-2015, 11:30 PM   #15
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cammed engines that see track. And speaking of AC Delco plugs, they always perform with more torque than NGKs.
Thats funny
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Old 10-16-2015, 12:13 AM   #16
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You're not supposed to re gap iridium tipped plugs. It can ruin them.
First I've heard of that. Done it several times and I know people much older and more experienced than me who have done it for years with no problems.
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Old 10-16-2015, 12:57 AM   #17
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I have spoken with NGK on the matter. The TR55s were rumored to be 1/2 of a heat range colder, but that was just a rumor based on a misunderstanding. It is a designation of the heat range (5) and another digit (the second 5) to denote the increased gap. It was NGK's response to GM's initial spec of .060 plug gap. They actually still work well in the trucks that have a slightly higher coil output voltage. They strap is actually manufactured to be longer, allowing for the .060 gap. The iridiums aren't recommended to be gapped because of the fragile tips that are regularly broken with a tapered gap gauge, and if gapping the TR55s down to the standard TR5 gap (.040), the strap wasn't designed to move that far. The TR5s are good plugs, the TR5IX perform just as well, but with a slightly better idle in my experience. I run the TR7IX in my blower car, and the TR5IXs in my 6.0L truck and 5.7L LS1 swap Cutlass. In a cammed car, I'd still run a TR5IX on a road course, except if I was running 91 octane instead of 93, I'd consider TR6IXs.
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