i’ve been reading and gathering info from here for about 2yrs. i have a Predator haul 13’,O 360,3 blade 68’’excalibur prop. Kinda new to airboats but not. Back in 1974 my dad ran a gore with a io360 and can’t remember what my uncle ran gore haul Lycoming ??? Anyway read a post on CM DD V.S. AC got me thinking (now there’s some trouble) you have a wide range of performance parts for CM but a limited parts for AC if I’m right? or really deep pockets. the camshaft is what dictates power and where it comes in at. But from what I’ve read phase 3 is about the best we can get? would like to hear back watch you think?