What spark plugs does everyone use on their Ls1's?

 

Do a search for Sparkplugs and you'll find lots of threads with your same question and the answer.

 

NGK TR6s at .038 gap...

 

Ngk Tr55.

 

It REALLY doesn't matter as it's not going to give you any gains over whats stock rated... ... NGK TR55's are cheap - but usually don't last as long as Platinum Plugs, but you're going to pay a pretty penny for platinum plugs...

I'm using NGK TR55's with about 10K on them and otherwise no problems...

 

TR55's...

 

Ngk.

 

Bosch Plats is what I wil lbe putting in next week.
Im at 94K.. should be just at 95K by then. The car has been mine since day 1. I have gone this long on the stock AC Delco plats..