A neighbor of mine is hooked up with West Coast Customs. In his driveway right now is an amazing old car owned by Travis from Blink182. Out in front of said car is a crate motor intended for said car.
Here's where the story goes on-topic: the engine is an all-aluminum, twin DOHC, 32-valve, VVT, distributorless, 300 HP 4.6L Northstar engine. The thing looks dope, and the idea of matching this old time hot rod with one of the smartest engine Americans have made is so cool. The engine has two legs up on us: it's 9.5:1 compression is better suited to supercharging than our 10.5:1, and the extra displacement would be nice in some ways. As far as I know, Toyota still doesn't do an aluminum version of their 4.7L, so swapping blocks for the 4.7L would be a significant increase in the boat's empty weight.
Also....I noticed that a friend's Centurion Avalanche had a 13x11.5 ACME prop on it. He's running the 350 Magnum which has a redline of 5000 RPM and lists at 315 HP. The final drive ratio (if that's what you call it) is 1:1. Now, to make a simple calc to show how much prop that really means...RPM times gear ratio times inches of pitch divided by a mile of inches equals MPH at redline. In actuality, there's other stuff like slip, diameter, etc., so the actual number's no good, but the comparison is. His 5K RPM through a 1:1 tranny into a 11.5" prop yields like 55 mph. This compares to my S22's 6K RPM though a 1.26:1 reduction into a 13" prop and 59 mph.
In other words, compared to the Avalanche, we're overpropped. And not by a small margin. Factor in that we probably come up a little short in terms of torque and that the Avalanche is intended from the start as a wakeboard boat....we're over propped. Period.
