OK... the number for NGK is 1-877-473-6767 ...ask for John
Right now I have R5671A-10 plugs gapped @ .035 ...they cross over to an AR3932. John recommend that I try a BKR 7E ...this plug has a projected tip compared to the 10's I run now and is supposed to take care of my hazing condition with the 200 shot. I upgraded from a 6AL and Nology coil to a Digital 7 plus box and HVC-2 coil to put some more fire in the hole before I try the hotter plugs... maybe I'll catch you at Cordova
and check out your combo.