PCM engine education - 2003 Tige 24v

[toastie22]

Hi, New to this forum, and I've just bought my first wake boat - BIG step up from my old 80's Sea Ray outboard which the kids have all learnt to wakeboard behind.
I bought a 2003 Tige 24v and it has the PCM 330 Excalibur motor.
I'm not a mechanic, and I'm just wanting to educate myself a little on these.
- what year did Tige start putting PCM motors in the 24v?, and when did they stop and why?
- given they're the mainstay motor in Nautique's, can I assume that it's a good motor to have in this boat?
- it's done about 500 hrs, and the compression test from the dealer came up at 210 - 205 across all cylinders, which from the little I know seems ok to me, ie not huge variation between cylinders.
- When looking for a boat to buy, I came across some other brands that had closed loop cooling or raw water cooling - is that something this engine will have, and if so, does it need any special maintenance?
- is there any typical maintenance items I need to keep an eye on with this boat / motor, and what are the known issues, and what would be the annual things to do mechanically.
Thanks so much for any / all input.

[chpthril]

At the end of the day, regardless of whose name is on the tag as the marinizer, the long blocks are all GM built.

Tow boat engines typically come 100% raw water cooler or partial closed cooling. Partially closed cooling typically means the exhaust manifolds still get lake water. The block is cooled with traditional antifreeze.

[toastie22]

thanks for that chpthril - much appreciated.