k, i got the heads back on. this thing doesnt have head gaskets. just o-rings. at any rate, i bought a cheapo compression guage at auto zone. hooked a fresh battery up to the starter and went at it. for some reason the motor turned over real slow and i was only getting 30 to 40 pounds per cyl. just to see what would happen, i pulled one plug from the other side and tried again. motor turned much faster, still pretty slow though, and reading jumped to 75 pounds. then it started to rain so i gathered my tools and came in. anyway, i gotta ask, how do you test compression on an outboard? should i pull all the plugs?