[Hib Halverson]

I just love old threads....

When I owned Barney, at first, I used the Denso IT20 (an iridium plug) which is about the same heat range as the originall LT5 plug the ACD FR1LS, but then, once I learned I could go colder and still run on the street with no fouling?mainly because of my hotter coils and Haibeck's good calibration, I went to the IT22 which I stuck with for the final five years I owned the car.

Even today, I still love the Denso 22 heat range.

I use it in my '04 ZO6 (IT22), in my '12 ZO6 (IT22) and in my '19 ZR1 (IVT22).