Okay, I have heard a 500HP limit in class 6, Could someone post what they know about the boats that are to be in six. and thier respective powerplants. The only boat I know anything about is Smith Bros. which has a 496 with Headers. How is this determined as well, Just as a class we all look at the motor and agree that it is making 500 hp.? I am looking at mimicking an HP 500 carb. as i have carb, and intake, and several other components to get there, ( still need a 502 block to build ) just wondering what else will be in the class.