Spark plugs

Denny Dormaier · 08-09-2011, 02:07 PM

My street hemi (10.5:1 C.R.) likes N12Y Champions. The colder plugs foul within 3000 miles. The race hemis (11.5 or greater C.R.) work fine with N6Y Champions. I've tried NGKs. They didn't work any better or worse than the Champions. I tried Autolite's and AC. No luck with either as their heat range selection is not as good as the Champions and NGKs. In the street car I gap the plugs at .035 and the race motors are gapped at .040. The street motor has a stock dual point and stock coil. I've run a Chrysler silver box, a Chrysler gold box and a MSD-7 on the race motor. I wired them side by side. Made 3 passes, with no difference in performance.

Denny

08-09-2011, 02:07 PM	#5
Denny Dormaier Junior Member Join Date: Oct 2005 Location: Enumclaw, Washington Posts: 23 Likes: 1 Liked 0 Times in 0 Posts	Re: Spark plugs My street hemi (10.5:1 C.R.) likes N12Y Champions. The colder plugs foul within 3000 miles. The race hemis (11.5 or greater C.R.) work fine with N6Y Champions. I've tried NGKs. They didn't work any better or worse than the Champions. I tried Autolite's and AC. No luck with either as their heat range selection is not as good as the Champions and NGKs. In the street car I gap the plugs at .035 and the race motors are gapped at .040. The street motor has a stock dual point and stock coil. I've run a Chrysler silver box, a Chrysler gold box and a MSD-7 on the race motor. I wired them side by side. Made 3 passes, with no difference in performance. Denny