O.N.

If Running a ZL1 with highflow 100cell cats, intake, 160 thermostat should you run NGK TR6's?

Stock boost nothing done to it other than whats listed.
Getting tuned soon once all mods are added.

NicD

iTrader: (7)

I would run the factory plugs.

LIL6BT

I second NicD on this. Until you start cranking up the boost, the stock plugs will work great.

Just check gap and run with it.

O.N.

And what about if running say a 2.55 pulley from Lingenfelter?

Jason Haines @ LPE

Stay with the stick plugs even with the 2.55 pulley. We stay with the stock plugs even at 750 HP.

Don't switch TR6 at all for any power change. They are a hotter plug than the stock plug. OEM plug is similar to a NGK TR7 or a DENSO IT19.

If you need a colder plug (big power adder, sustained time at load etc) the IT24 is a good option. At 1200 to 1400 HP we have used both the IT24 and IT27. IT27 more likely foul out when cold/idle.for drag racing IT24 is enough. For sustained load (standing mile, marine use etc) IT27 would be better.

Jason