TR55??? why?Either TR6 after you have added mods, Normally after 100+ hp over stock otherwise go with the TR55's.
Whats wrong with them? I see alot of post on LS1 tech that mention using them. Also its what my service advisor suggested to use. I have used them with headers cai and tune with no complaints, even while cammed they weren't bad.TR55??? why?
I dont know about you or where you get your spark plugs from but I almost always have to re-gap them, But I get what your saying. Other than being gapped at .060 there is nothing different with the TR55s and they do the job well just like the TR5. On another note I ran mine at .050-.055 IIRC.wrong gap right out of the box. Gapped at .060
The TR5 is THE SAME heat range, gapped correctly out of the box.
You could get them (for the same price as TR5) and regap them...no idea why anyone would want to do that - unless they were out of TR5s.
that's certainly an option.yall are crazy leaving a plug in a head for that long... i've got 19k and i'm going to change them to plain ol' TR6's
How do you like those?AC Delco Iridium OEM Corvette ZR1 Spark Plugs (.040 Gap) here, just changed them out at 83k. AC Delco P/N is 41-104.