i would say .032 with ngk 4305's 
yea 4306's irridiumsROBSSRT4 said:correct .032-.035
i order ngk iridium ix cooler plugs ? what about the gaping? on this? what do u think about this sparksgetnpsi said:if you dont mind waiting you can call up ptp and see if he still offers a package with plugs wires a coil sheild and his check valve. I think he had them in colors too, but dunno bout yellow .