What spark plugs are you guys running in your 408 strokers?

You base heat range of off compression ratio to start, but you really need to make sure the base ring is heat soaked about 2-3 threads. Too cold- plug fouling ...too hot-predetonation from the plugs temp setting off mixture before spark happens.

Pick your brand, for they are like favorite colors.

One tip I can give you, pick one that has a base ring you can actually see color change on ;)

Google spark plug reading, enjoy.