Spark plugs ? Denso it-22 iridiums?

[Vette73]

Looking to swap out my AC Delco plugs in the spring (that's what came with the car).......Car is a 91 with some mods- headers, exhaust , top end porting...

I see some members are running the Densos.....Any recommendations?

Of course I will check before I install,but, do they come pre-gapped?

Thank you...

[efnfast]

There have been a number of threads on this already. Do a search, you'll find some good info out there.

[Hib Halverson]

I've been using the IT-22 for about ten years in my LT5. Great plugs! With the success I had using them in that, I now use either the IT-20, IT-22 or the IT-24 in all my engines except the one in our new ATS-V. Just haven't gotten around to changing to Denso in that.

They come "pre-gapped" but I sometimes change that depending on the engine and the ignition coils being used.