Well, just for chits and giggles I tried replacing the head gasket on the port side of my yam.....Bolted it up, torqued it, and now have 130psi on the cyl I had 90psi on....the others are all the same...I did not run it yet (neighbors wouldn't appreciate it lol...), plus I need to get thermostats for it....My dumbazz pulled a t-stat out last night and tore the gasket....D'oh!! Oh well, I bolted the housing back up with some RTV so I can run it on the hose and be certain all is well...Just need to do some finish up in the morning and I'll fire it up! Yee-haw!! I ain't gotta pull the powerhead! I'm a real happy camper right now....