I have 2 Very STRONG Carbed 500HP's. These are now 509's both completly freshened up last year approx. 30hrs ago. These motors were bored .030" over,cranks and rods were magged and polished,std H series rod and main brgs, Wisco pistons and rings,new severe duty int. and incolnel exh. valves,new upgraded roller cams and valve springs,cometic h-gaskets...all the good stuff. Over 6k in rebuild costs. They are in a 37 OL and run 85+. Boat is in storage so I have no pics! They look like any new Merc. 500hp carb. 10k for the pair with no accessories or 11k with all but exhaust...some may be cheaper but I guarentee these are perfect.