I installed a CC306 w/ stage II heads and ported intake, I also have every other bolt-on to go with it. Thunderracing suggested running the TR6's but I heard that on a N/A motor they sucked? The heads have been decked .010" and also I am running the impalla head gasket. I pulled the plugs the other day after about 200 miles and they were a dark brown color and I wasnt sure if that was how they were suppose to look or not. Any suggestions on what everyone else use's?


Thanks,
Chad

 

IMHO I would go with TR5's. There is no need to go with TR6's unless your are running nitrous or a blower.

 

AutoLite 106

 

TR55s.

 

There is no significant difference between these plugs - 1/2 a heat range is trivial. It would take extremely sophisticated testing to find any operational difference between them. IOW, they are identical for practical purposes.

Rich Krause

 

Thanks for the input guys I guess I will keep the TR55's.


Chad