I bought the boat used it has Dart Al. heads. I'm going to change the plugs and can not find a torque number for the plugs. It has 3922 autolite plugs seems to be a standard plug. Boat runs fine and idles fine just stubbles a little when you start giving it throttle. Thought i would start with the easy parts first.

use antiseize on threads.

Anti seize is a must. Use a 3/8 ratchet and just sug them up with one hand only. Many aluminum head manufacturers do not recommend using a tourque wrench for plugs on their heads.