My 440 with MSD and 12.5 domes, 1050 Dominator and Stealth heads I run .040.Its street driven and no problems.My sons 413 with MSD same gap.I run NGK plugs and they seem better than the Autolites I was running.Rocky

Last edited by therocks; 06/25/11 09:43 AM.

Chrysler Firepower