I know there is a colder plug than a tr6. However I can't remember the plug #. Can anyone help me out.

 

I couldn't find a "TR-7" plug from NGK. I went to a Motorcraft instead. The Motorcraft AWSFA-12C is one step colder than the TR-6, but it's not stocked very many places. Ford house can order you a box of 10. The Lightning guys use them in their supercharged engines. I use them with a 100 shot in a Cobra. They are only threaded for 1/2 the length from the seat to the tip. I am not sure there is enough thread for the LS1 engine. If they have enough thread, these will work fine. I run the TR-6s on the street on motor and up to a 75 shot at the strip.

Joe Lynch

 

Thanks for your input but thats not what I was looking for. The plugs are an ngk # ,anyone else????

 

how about tr-55s

 

BP7EFS NGK PN 3526 is a colder "nitrous" pulg. There are a few others...but you will have to get with NGK.