Anyone running the AC Delco #41-602 spark plugs? I know they are one stage colder than the ones supplied in the GM LD9 Charger kit. The kit plugs are gapped at 0.038 and I'm just checking to see if i should run the 41's at 0.038 or perhaps 0.035.
I am using NGK TR6IX at .035 on an LD9 with the GM S/C kit. I called NGK and their tech support recommended 1 step colder at a .035 gap for what the GM kit makes for boost.
Hope this helps in your decision.
