Well Brian i just dont know... its like you need to try to put a stock head back on there to see if it goes away.
but just one more time for kicks and giggles if you have the autolite 24, the champion requires 103s i think better search and see im off to work now cant look it up for ya yet,
but just for kicks start this time with the plugs at .024 gap then work up if it doesnt do it but this is as low you can go i think. just try it i know you did .30 or was it .28, but just go to .024 on these , I'll look up the autolite 103 but they were for alum. i dont know what the irons were. later dude hope u find it.
but just one more time for kicks and giggles if you have the autolite 24, the champion requires 103s i think better search and see im off to work now cant look it up for ya yet,
but just for kicks start this time with the plugs at .024 gap then work up if it doesnt do it but this is as low you can go i think. just try it i know you did .30 or was it .28, but just go to .024 on these , I'll look up the autolite 103 but they were for alum. i dont know what the irons were. later dude hope u find it.