Hey guys need help finding the right part number for the ngk tr6 plugs that are 2 ranges colder than stock........no local parts supplier seems to have a clue as to what heat range stock is , right now im using non platinum motorcraft plugs and lets just say they aren't exactly what i wanted them to look like after spraying the 125 several times now ,, i definitely need the colder ones........thanks

 

There is a great thread at Modular Depot that has spark plug info:

http://forums.modulardepot.com/showt...&threadid=2218

 

thanks man......

 

TR6's are only one heat rang colder. but the part number is 4177.

I dont know the part number for the TR65's which are 2 ranges colder. is that the right name i heard they might of changed them.

 

tr-55 or autolight 764

 

autolites get my vote!

 

the TR55's are stock heat rang though. he needs something colder than that.

 

oops i suck at the readering. sorry