My point is that a bone stock V10 is pushing 600...getting to 700 with some modifications is a pretty simple situation on pump gas. These engines DO respond amazingly to mods and a skilled builder can make that happen.

Yes, but if you take that 600 hp stock engine and put it into a boat, it will not last long. Make that 600 hp engine live in a boat, and then make it live and run pushing 725 hp. Nothing easy or simple about that.

Give me a break. My Viper is making well over 550 at the crank and all I have is headers. Squeezing out 50 more HP through minor modifications is not going to severely weaken an already stout engine.

Taking a new Viper engine, making it breathe and making some small changes does not make a grenade waiting to happen at 700.

Might not be easy or simple but Ilmor seems to make the engines live no matter the loads placed on them at all the HP levels. I would not hesitate to put an Ilmor in a new boat or buy a pre-owned boat with an Ilmor.

That's exactly what's impressive about Ilmor's 650 and 725 engines.