I am putting on my D1SC this weekend, on my LT1 i just put these direct replacement ngk iridium's in last month, or should i go with a tr6?? Thanks

 

I would definitley switch to the tr6 especially if you are stock internally. They are a heat range colder to help you stay out of detonation...go grab some...they are like 2 bux a piece.

 

I can't say about supercharging but I can sure tell you there not worth a darn in a turbocharged car. Stay with the TR6

 

I use the TR6's, I would stay away from the Iridium or any platinum plug for blown application

 

You don't want to run any kind of plug that has a grounding pad spot welded to the ground strap(s). Many of the newer "precious metal" plugs have these pads. They could come off in a supercharged application. One heat range cooler than stock, just your basic resistor plug, should get the job done in a street setup up to 12 pounds or so.

 

TR6, NGK Iridium, Autolite 103, etc.

My car could care less. They all work, none seem to make a difference. My problem needed programming and DELTEC!!!

Gapped at .030. no improvement, no decrease. Just a lot of headache to change them.

ATI #8PSI, 383 with -31cc JEs.