What plugs are you guys running in your Lt1s.

Im not sure the age of mine or really whats good for it.


I know the pcm has been re programmed. (for the fans i think an rev limiter?)
Has the cooler thermostat.
Slp headers full 3" exhaust.
K&n cold air intake.

Few other things done to it but there not motor related.

I have yet to find out if there is any internals done to it.

 

Many many people run the NGK TR55's and like them. I did for years in LT1's but now with the added compression and higher combustion chamber temps I needed to go colder.

 

Cool NGK at my work is some of the cost friendly ones.

 

Yeah I'm running tr55's and going to tr6's for cooler plug..

 

I run TR55's and have been very happy with them so far. They're probably some of the best plugs out there for the price.

 

I ran the TR55s for awhile, but i feel there a tad hot unless its a just a DD & not too much thrashing in stock form, now i went with the TR6s, because i'll be running alittle juice, they are holding up very well NA, even in stop & go & cruiseing around, so i say get the TR6s, especially with bolt-ons., gapped at .035"

 

Im running TR55GPs. Only had them in for a little while but so far they are great.

 

Well now i have the problem of which tr55

tr55 Vpower ($1.38)
tr55gp Gpower ($2.12) ( has needle point)
tr55IX Iridium ($5.40) ( has needle point and pointed finger)

 

x2...I had the NGK TR55's as well and they worked great.

 

I would just get the tr55 vpower, that's all most run. Some guys are running the iridium units, but they are too fukin pricey for me.