1972 Corvette LS5 plug fouling question

[Jon Foster]

Just got my LS5 engine rebuilt to stock specs except for a bump in compression to 9.5-1. Stock cam, carb, everything. 50 test miles on engine and I have fouled the #6 plug twice. Not fuel or oil fouled but black carbon. Other plugs are lightly carboned. I have AC 44t plugs in along with a new cap, rotor, points, wires and condensor. Are the plugs to cold? ANY suggestions? THanks, John

[Dave S.]

Re: 1972 Corvette LS5 plug fouling question

Jon,

I'd try an R45TS which is hotter and has an extended tip(S). There is a good chance that it will solve your problem.

[Clem Z.]

Re: 1972 Corvette LS5 plug fouling question

make sure the plug wire is all the way into the distributor cap and also check it with a ohm meter to make sure that the wire is good.