any of u guys ever have a problem with piston and sparkplug contact? i just put together a gsr with 12-5-1 cp's and i got ngk zfr6f's and they hit eachother, i had a set of used plugs that came out of my old turbo car (ngk r5671a-7's) and they are about 1/4in shorter than the other ones,never noticed this before.i never had this problem before wondering if anyone else did and if u did what plugs u using?

 

you used ls plugs that have a longer electrode reach, TRy bkr7en11, colder plug with a shorter electrode

 

nice, thank u