What spark plugs for the ls2?
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I wouldn’t consider it a bad thing to do. Matter of fact, I’m going to pick up some myself. As far as the gap, I’ve seen some at .50 and .55. I’m in no way an expert on spark plugs, but from what I’ve read, TR 55’s are for mostly stock cars with heavily modded cars using TR6’s. Hopefully somebody else could shed a little more light on this topic.Ozzhead said:
The gap that plugs come in doesn't matter. That can be changed with a gap tool. Its a little piece of metal that has both sides angled, one usually from .020-.045, and the other side from .045-.070. Just slide the tool between the curved metal and the base post up to whatever gap you want. Most tools also have a hook on it to bend the gap back. Basically all you are looking for is a plug that is slightly hotter or colder than stock, depending on what you wanna do. On my 69 GTO, with GM HEI ignition, I used the R44s with a gap of .047 , but the stock plug was R45s w/ gap of .035, Ram Air IV used a R44s w/ gap of .035. It all depends on what your specific engine likes. Just buy the tool, and try a bunch of different gaps.
A quick guide:
Bigger gaps= more spark travel (better combustion burn), but can get covered in gunk easier
Smaller gaps= less spark travel(worse burn), and less chance of gunk
Just find the happy median.
A quick guide:
Bigger gaps= more spark travel (better combustion burn), but can get covered in gunk easier
Smaller gaps= less spark travel(worse burn), and less chance of gunk
Just find the happy median.
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Started with T55's when the cam went in and changed to the Tr6's. not a bad idea to change them.raven1124 said:
Thanks for the info. I might just replace them to make sure they are right and to inspect the factory intalled ones for anything abnormal. Besides, this is the first new car I've purchased in the last 15 years or so where I can actually get to the plugs.
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87 Posts
Can I put tr66 even though I aint got a maggie yet? I'm gona get a cam first than a maggie next summer! I got a volant CAI,SLP lt, 3inch custom muffs, getting the tune done at cam change!
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the question is still in the air over what would be the best gap!!!What are u maggie guys running? how about someone with a cam swap,lt's,cai??
I replaced the stock plugs last night with NGK TR55’s. The install took a little longer than I wanted. It didn’t help that I dropped a plug and socket on top of the skid plate. It would have taken about thirty minutes if I didn’t have to jack the car up and remove the skid plate to retrieve the plug and socket. The plugs seem to work really well at idle and during acceleration. I haven’t got to go WOT yet to really get a good test. I gapped them at .55. Hope this helps you guys who may be considering doing this mod.
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87 Posts
I'll try the tr55s thanks guys, so easy to do i love this car! HEY what about plug wire's u guys have any ideas? I've seen soom Jacobs stainless steel braided one's but don't know if they make em for our rides, got any suggestions???? THANKS
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87 Posts
Do you have a part #?? I checked out there site looks like your planning on fiting a custom fit set wright? Couldn't find one for our cars or the corvette ls2's
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87 Posts
Thanks Raven I'm ordering them as soon as I find out what u would recommend for plugs looks like they have Regular tr-55's and iridium tr-55's,schould I get the iridium's? Also I'm planning on adding a cam and a mild N-20 system maybe a 75HP system,maybe the tr6's would be the way to go than?? what do you think?
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