My 422 smallblock build

i tried some ngk platinum tip plugs back in the late 70's when they came out on a honda 400/4 i had (was still into bikes then). i used to work that bike hard and the platinum tip plugs didn't last. 2 melted the tips off after a couple of weeks. i returned them and swapped them for 2 sets of normal ngk's (they were half the price of the new fangled ones). i've stuck to normal ones since on cars and bikes.
neil.