I'm getting a whistle (sounds like a vacuum line) Only does it at around 1500 to 2000 rpms. Pretty sure it's not the belt. It's brand new, tight, and the sound doesn't sound like a squeal.
The block was just replaced because the previous owner burned it up. It's a 6.2 Liter black scorpion. Has about 13 hours on it now.
On another note, the boat dies if I throttle it up and let off too quickly. I have to slowly back it off. Any ideas on this as well?