go with iridium plugs they will last longer, the plugs Suck to replace. Do it 1 time and you will know what I mean.
98 Z28...799 Heads, LS6 Intake, 5308 Cam, Linginfelter Oil Pump, LS7 Lifters, LS2 Timing Chain, SLP Lid and Red FRC's. RevMax 2800 Stall, Hyperflex Suspension Bushings and Motor Mounts, Drilled and Slotted Rotors.
2008 Corvette CRM 3LT. C.A.I., ZR1 exhaust w/NPP.