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Thinking about spark plugs

This is a discussion on Thinking about spark plugs within the External Engine forums, part of the LSx Technical Help Section category; OK - so I have read several posts about NGK plugs and how the TR55 and the TR6 seem to ...

  1. #1
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    Thinking about spark plugs

    OK - so I have read several posts about NGK plugs and how the TR55 and the TR6 seem to be the top choices. Here is my question - after searching for the plugs on the NGK site, it seems neither of these plugs are recommended for LS1 applications. If anything the camaro/firebird V-6's are listed but not the V-8's. It seems to me the TR55 equivalent for an LS1 would be the TR5 which is for "regular" applications. When searching for my 2000 SS, there were 4 other choices above the TR5 made with platinum/iridium (although more expensive) that seemed better suited for high performance, durability, and longevity.

    Why do people insist on the TR55 and TR6? Am I missing something here?

    I was going to buy some TR55's tonight but now I am thinking maybe there are better choices.
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    cutting and welding mark21742's Avatar
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    personally I like and run Autolite AR103s

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    TJEA Retirement Home Dr.Crash's Avatar
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    I think you need to find what works well with your car. I ran a couple of different plugs before trying the TR55's and thats what i decided to go with. you dont really need to run the iridiums unless you have a reason.

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    I think I may actually have the TR55's in the car now (installed by previous owner) and have had good luck. I am doing a full tune up now at 71k because I am getting a rough idle and arcing from a couple coil packs down to the valve cover. Not sure if it is a spark plug, wire, or coil pack problem.

    It just surprised me that NGK does not recommend the TR55 plugs for our cars.

  5. #5
    Moderator Firebirdjones's Avatar
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    Quote Originally Posted by mark21742 View Post
    personally I like and run Autolite AR103s

    I'll second the Autolite's. I run the APP103's in both cars. I never liked the NGK plugs in anything at all.
    Heat ranges are just plain hot compared to others on the market. We found the NGK TR55's to run even warmer than the stock AC heat range plugs so they were pitched.
    Alot of people run them and have good luck with them though. The engine builder I worked with for a few years hated them, made in Japan anyway.

    If you want a stock heat range Autolite plug for the LS1 it would be the APP104's by the way. They worked great as well. Switching to a colder plug though got me onto the autolites since AC doesn't list any heat ranges for the newer plugs anymore so it's hard telling what you are getting.

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    The NGK TR55's fouled out on me with some high octane boost added. All eight of them. I recomend iridium. Mine are AC Delco. They be 7.99 a plug, but you are getting what you pay for. Smoother idle, no fouling, and you dont have to change them as often!
    Last edited by BADASS2000SS; 04-05-2009 at 08:24 PM.
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    I used Delco Iridiums on mine, for the simple fact that it's a PITA to change them, and I don't want to do it again for a long while.

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    i had the TR5's in my LS1. they ran great, no problems with em. car ran alot smoother than the 74k stockers lol.

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    they were the iridums too, btw.

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    I cant find the TR55's anywhere around me. The parts stores didnt even have the TR5's in stock. Whats the difference in 5 and 55? Just heat range? The 5's are 3.89 + tax a piece. I had autocrapzone order me 8 TR5's. Now Im thinking I will wait for TR55's.

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    408 ci + 4000 stall = fun lancesT/A's Avatar
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    the shop that did my cam and dyno put in the tr6s cause they said they were the best for me i just took there word on it they are a really respected shop in my area

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    Hmm, I usually hear TR6's being a nitrous or FI plug.

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    Senior Member Blown Interceptor's Avatar
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    Quote Originally Posted by mark21742 View Post
    personally I like and run Autolite AR103s



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    Slow'er'Ass Mr. Luos's Avatar
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    Autolite's are good.
    NGK TR55's are good.

    I personally run the TR55's. If they need to order them, so be it.
    Plug change is roughly 50 minutes....so I do it annually.



    Quote Originally Posted by BADASS2000SS View Post
    The NGK TR55's fouled out on me with some high octane boost added.
    You blamed the plugs??
    Maybe it was the 'boost' of octane (actually really a .1 octane point boost per bottle) that junk gave you.
    Stick to premium fuel from good stations and stay away from that octane booster crap.

  15. #15
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    Quote Originally Posted by Mr. Luos View Post
    You blamed the plugs??
    Maybe it was the 'boost' of octane (actually really a .1 octane point boost per bottle) that junk gave you.
    Stick to premium fuel from good stations and stay away from that octane booster crap.
    http://www.installuniversity.com/ins...b_8.072000.htm

    Ill back Mr.Luos up with some facts....

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    Well I ended up going with the TR55 plugs. I got them from my local autozone (in stock) for about $2 each. I decided on the TR55 because the gap is close to what my GM service manual recommends (.060) and thats what was installed in the car from the previous owner. I gapped the new ones to .055. The old TR55's in the car were worn a bit (.065 max gap) but not bad i guess for 40-50k miles. The new plugs and the MSD wires corrected my misfire and coil pack arcing problem. Car runs great now. Took me about 4 hours to do the plugs and wires (my first time). It was not as bad as I thought it would be.

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