340 Sparkplugs

My plug is close to perfect, it will foul in cold temps if I let it run under 1,500 too long. The projected plug is the way to go IF you got enough octane for it. My engine was border line with straight pump fuel, most of the time it was OK but not all the time. So I tried non projected plugs without touching the timing and I have yet to hear it ping, HP did seem a tad off..I have yet to re ET it at a track

I run a MSD 7 box and HVC with those plugs, I';m sure the cold fouling issue would be worst without a hot spark

BTW if you have a miss now, new plugs likely won't cure it..the only time I had a miss at high speed was when one plug boot was crack and leaking the spark to a header pipe..so check those wires and boots if you do change the plugs..I'm running Champion wires I got off Ebay..Nascar Wires I looked under