Currently, I have tr55 gapped at .040. Never had any problems NA, but with SC now (boost here and there), i'm getting a small miss at low rpms. I'm thinking its a little too hot of a plug for the application. Going to pull plugs next weekend and run compression test and i figure i'll put new plugs, ngk tr6, in as well. Car getting a little hotter than usual lately too, but its still mid 90s outside. Hope its not a head gasket. Also, i have LTCC if that matters or not.

Thanks,
James

 

I've had good luck with Autolite 104's. I don't like the NGK screw on tops. Are you running a CD style ignition box? If not I would look into adding a MSD or Accel ignition setup to your system.

 

I ran TR6s in my LT1 gapped at 0.032 and the same with my LS motor, no isssues here. I have only brought the LS motor to 6400rpm or so but it didnt break up!

Jay

 

+1

 

I run my tr6's at .035 without any problems. This is on a procharged ls1.

 

Thats my setup also

 

lt1 f1A TR6 .035 simple for ya

 

sweet, going to go buy them tomorrow and install, .035 it is.

 

I don't think NGK has screw on tops anymore. Think that went away a year or two ago didn't it?

Either way. TR6 at .020 here. I have run the next step colder which is like a br7something.

 

br7es or something like that...

 

Im using tr6's gapped to .028. Ive heard lg. amounts of boost or nitrous call for the next colder range to be safe. Im planning on boost and nitrous so I think im going to run the br7's on the 383

 

The 7s fouled out on me pretty quick but I wasn't beating on it yet so.... Probably depends on driving.