So the motor has 56 hours on it, but had new manifolds installed 3 years ago?
QUOTE]
Yes.

The Orig Owner said that he had all of the scheduled maintenance completed on the boat even if the hours didn't say it needed it but the time frame (age of the boat/components) deemed it necessary.
I said earlier that the water pump has not been replaced to my knowledge.......
I'm not trying to give you guys false information, I'm meerly trying to diagnose a problem and giving only the information I have to this point.
Trust me I was as suprised to find this old of a boat with this low of hours on it. I took that into consideration when buying it knowing that it has sat more than been in the water; however, the Orig Owner did take very good care of it.
I'm a little confised about the flushing techniques discussed here. Some state that using the hose bib doesn't flush the whole engine but the muffs do, and others say that the hose bib does in fact flush the whole system. What exactly gets flushed with the bib and what exactly gets flushed with the muffs? I would have to believe that something gets left out in one of the two scenerios.
Regardless, do they make an "engine flush" for boats similar to what you would use to flush your coolant system in a car? I realize that there is no way to keep the system sealed (to my knowledge) as in a car so this might not be possible and I may have just answered my own question.
If my problem is the worn impeller potentially, am I basically replacing the waterpump as if the V6 was in an S-10 or is there more involved. I worked as a mechanic through college but am VERY infamiliar with boats (this being my first I/O). Bear with me guys, I'm a newbie at this stuff and I don't know all of what transfers between automotive and watercraft.