I did a search but can't find just what it is I'm looking for.

I'm spraying a 150 shot and want a good long lasting plug.

I hear NGKs are good...but which one is it I need? NGK TR55?

 

Well NGK TR55 are good plugs, alone with autolite 104/103 depends if you want a cooler plug. I've used both and my TA perfer the autolite, other members on the board perfer NGK. JMO for autolite is if one does go bad you can find them in about any part store compare to NGK. Somethings you have a hard time finding them in stock.

 

I just bought the NGK TR6s to replace my old autolight104s, think they will last any longer?

 

TR6 is also good. I belive it's the same heat range as 104s'

 

I had a problem with ngk tr6's. I Miss fired like crazy right after i put them it. I took it to the dealership and they told me they replace two of them because they were bad. I will never go back to NGK's. There *** plugs anyways..

 

I ALWAYS had black spots all over the ceramic on my TR6s after spraying. I lost about 3-4mph in the 1/4 because of this. I have Autolite 104s in now and all is well.