Rob94hawk

iTrader: (1)

I have a set of NGK TR55-IX Iridium Spark Plugs that I never used. Anyone out there using these for a compression ratio above 11? I could go with copper but since I have these already I might as well see if they'll survive.

Fazz73jr

iTrader: (3)

I was told to go with a tr6 with my 11.8:1 383 lt1. Put that's also using shitty California 91 pump gas.

RamAir95TA

iTrader: (2)

I don't see why they wouldn't work fine, but the best thing to do is ask your tuner to be 100% sure.

But something to consider...as cheap as spark plugs are and as crucial as they are, it pays to use the correct heat range plug. Use the incorrect heat range and detonation can ruin your engine. Having the mentality of "might as well see if they'll survive" isn't the smartest.

Not saying this is the case here because they will work just fine, but in the future it's certainly something to consider.

Rob94hawk

iTrader: (1)

I wasn't going to put them in unless they were the correct heat range. They're for stock heat range but since my heads were milled slightly and I just put 0.026" head gaskets on my CR averages out to ~11.2

quik95lt1

iTrader: (7)

you should be ok i ran tr55's in my 11.2:1 355 when i had it and it ran great..........just make sure the tune is ok and watch ur detonation just incase

Rob94hawk

iTrader: (1)

I'll give my tuner the heads up. Thanx