Thread: which spark plugs is everyone using?

It depends on your setup. Do some more research.

Well, you didnt ask for what "mod" level. Though this has been covered many many times.

Stock acdelco iridiums for stock. Copper cores ones modded. Your mod level kinda says what plug to run.

Originally Posted by Fivefingerdeathpunch

Well, you didnt ask for what "mod" level. Though this has been covered many many times.

Stock acdelco iridiums for stock. Copper cores ones modded. Your mod level kinda says what plug to run.

This.

If you're not running a smaller pulley than stock, keep the AC Delco Iridium stockers.

When you start increasing boost with a smaller pulley, you can start thinking about cooler plugs.

Ngk tr6 4177 .055"