[Hib Halverson]

The original Rapid Fire 5 was one of my favorites but it hasn't been made in over a decade. I ran them for a couple of years after it was introduced in the late 90s.

After that I fooled with a bunch of different NGKs.

Then, I tried some Denso Iridium Power plugs and have stuck with them since the early '00-s. They are incredibly durable, have a wide heat range and are available in either flat seat or tapered seat styles.

In my 95, I use the IT-22. It's worked very well in all kinds of driving from easy street to mild racing. I've also used the IT-24 in really abusive chassis dyno testing, but it's a tad on the cold side for any street use.

Interestingly, the IT-22 also works quite well in newer LS6es and LS7s.

RockAuto sells Denso Iridium Power plugs but I just bought 8 of the ten they had in stock. I spoke with the folks at Denso Sales USA last week and they said there is a temporary shortage.