need to know what spark plug can be run with the Dart 320 aluminum heads need a tapered plug.

The older heads use SHORT reach tapered seat plugs.

https://www.jegs.com/i/NGK-Spa...739/R5673-9/10002/-1


I use -7 -8 or -9's in NGK's

Lower numbers are hotter, higher numbers are colder

X2 that's the plug I run in my tapered seat dart heads.

which heat range plug for a 540 bbc aluminum heads no nitrous. which NGK plug.

what compression?

And what fuel?
I use -7's with alcohol, and -8's on race gas.

quote:

Originally posted by 1320racer:
what compression?

13-1 compression

-8