Ronald Weishaar
Well-Known Member
I been setting my spark plug at .035 but I'm second guessing that it should be more. Engine is a 540 cu.in. 10.5 to 1 compression, Indy 440-EZ-1 Heads, MSD 7AL-2 ignition box, MSD Distributor, and MSD Pro Power coil. I'm using Champion RC12YC plugs recommended by Indy. Does my plug gap need to be wider?