I just put on a new pulley and thermostat and am curious to see what everyone here runs. I'm probably going to run a couple ranges colger, probably NGK. Just curious to hear your ideas. Thanks.

since most of the guys including willwren run 2 heat ranges colder for the 2.2 pulley i would think that you prolly wanna run 3 heat ranges colder.

Autolite 104s gapped at 0.50 should do the trick.

But I think he'* one of the few people with the 160* t-stat. He may only need to run 2 ranges colder like Will. I don't think that one more ranger colder would necessarily be bad or anything, but I think just about everyone has a 180* t-stat.

My theory is 2 ranges, and no platnums.....They melt in Forced induction applications pretty much.

I would start with 1 heatrange colder, especially in winter. I ran 2 colder for some time, but found that I was better off with only one. I no longer run the TR6'*. I may try them again come summer, however.

Start with NGK TR55'* (one colder) gapped at .055".
If they don't look good in 3 months, switch to NGK TR6'* gapped at .050".

Thanks for the input guys. I'll post back and let you know what i decide after a while.

i have mine gapped a .55 also u gotta love da performance from these bad boys

I just looked up part numbers and it looks like Series II and Series I L67s use the same spark plugs. Can anyone confirm this? I'll just order some NGK'* off ZZP'* website if I know they're compatible for sure.

Go to NAPA. I order my TR6'* from them, and they have the TR55'* in stock. Yes, Series 1 and Series 2 use the same plug series.