You may be right...That was my first compression test and the motor has gobs of power. Last October (my last run of the year) I was pushing a 23p Mirage+ at 5000 RPM and hitting 65 mph. I havent gone WOT yet this year but dont sense any change in power. I had the boat professionally winterized to the tune of $800 (same place Ive gone to for years) so I really dont think anything happened over the winter.

None of this makes any sense. Im going to have someone look at the rockers and pushrods on Saturday and may just replace the exhaust gaskets at that time (they do look real rusty which doesnt make sense considering I never boat in salt water and should have been replaced when the engine was rebuilt)...This whole thing is just a big head scratcher.

Did you hold the throtle plates open while you where cranking the engine?

I would replace exhaust gaskets first, then take to mechanic if necessary...f.y.i Just because your mechanic charged you a staggering 800 bucks to winterize your boat does not necessarily mean that he did a quality job.

X2...Exhaust gaskets first! Listen to Griff and pacalim

No I didnt and the engine was cold--both things that could be effecting the results.

Im going to do that today. For some reason I got "valvetrain" in my head and discounted the exhaust. Yesterday during my compression testing I got a good look at the exhaust gaskets and they look like crap.

Correction: It was the intake manifold gasket

BTW, those compression are terrible if they are even close to correct. Those would be what I would expect to see on a 500+ hour engine.

Replace the exhaust manifold gaskets, run the engine up to temp and then repeat the comp test.

Replacing the exhaust gaskets isn't easy!! There seems to be one bolt towards the stern which is blocked and acts like a swivel (kind of a good thing)...problem is the power steering hose won't allow the manifold to go up more than an inch...running out of time today but I'm making headway.

Griff--I agree with you on those compression numbers. However, I have full power so something isn't adding up right.

Ok, well I replaced both exhaust manifold gaskets and both riser gaskets and ran the boat...the problem remains! Its clearly metal on metal (pushrod, rocker, lifter would be my guess). I pulled the valve cover on the port side but havent pulled it yet on the starboard...If the intake has to be pulled Im probably just going to take it to a shop!! This sucks because I really enjoy working on the boat but just feel Im getting past my comfort zone.