I need to do a tune up and alot of people have recomended the ngk tr55. I just wanna know if these are nitruous OK, and will hold up if i do future mods to the car. IE planning on doing a lt4 conversion alogn with all bolt ons. thanks.

 

The NGK TR55 are stock heat range plugs. This is not good for nitrous use. You will need a colder plug range.

Vinny

 

NGK TR6s.

They are a colder range plug with a narrower gap, to prevent blowing out the spark under increased cylinder pressures during nitrous use.

 

sounds good,
but is the colder plug safe to use if you dont spray often? or do u need to switch em out?

 

anyone have the answer?

 

Sure, Tr6s or autolite 104s are fine for N/A and nitrous use. I personally prefer the autolites for N20 use. I run the 103s.

 

I use autolite #104 with no problems what so ever.

Vinny