I just removed a GMPP crate 450 hp 502 from my boat.I am having it refreshened.I turned a B impeller at 5500.It ran great and took a beating with no problems.The engine has hyd roller cam 4 bolt mains forged crank 7/16 forged rods and JE 700 forged pistons.I think it is a great bang for the buck engine and with the right cam could turn more rpm. Mike