BigDB

Im building a 402 with Trick Flow heads, the spark plug stickie doesnt have TFS heads. Ill be running a 250 shot so ill need a colder plug, dont know if 1 or 2 stepd colder. What plug will I need? Tapered or gasket seat?

2002t/a06

iTrader: (2)

i think tr7's would be good for a 250 shot. not 100% sure though.

Flaco

iTrader: (4)

i have been using the ngk r5724-10 stock # is 7993. that is 4 steps colder, up to a 400 shot, but u can try those then go up a step r5724-8's.
its better to be conservative until you reach the correct heat range.

i usualy gap them at .020

BigDB

I take it that you have the trick flow heads? i guess 3 steps colder would be a starting point since its higher compression and a shot. Iv had better luck with the Autolight plugs then the NGK's with it idling and not fouling. Any idea of a part number?

Flaco

iTrader: (4)

no idea on autolites sorry, those 2 are the ones i usually use. but u can start it off with the -8's

BigDB

hey man thanks alot for the help, ill check into those part numbers and maybe I can cross-reference them.

BigDB

I looked up the part numbers you gave me and have noticed that the plugs arnt a resistor plug. Do we need a resistor plug to keep electronics from being damaged.