So this is getting annoying I cant get a plug to fit. I guess I need a 5/8 plug but only one summit has is a cooper plug. I am running a msd box and coil. Anyone know any other plug thats 5/8? I have indy ez heads. Is cooper the way to go? :/
you need a 5/8 hex 3/4" reach gasketed plug is what your saying, not a copper plug?
NGK V-Power such as R5671A-7, or FR4/ FR5 for a hotter street plug. Lower the -# is hotter in NGK.
