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? :/
I like the car it looks like mine; did you try V-groove plugs by NGK. This is the second vehicle I have them in and love their great performance. Champion is not the best choice in my opinion.
J-G
