I have a gen 5 502 bored 30 over(509)for sale,custom cam for marine kinetics,gm crank-eagle rods-diamond pistons-pro topline aluminum heads-ferea valves,comp springs and retainers-morel hydraulic roller lifters-jesel shaft rockers-dart intake-pro systems marine carb.Engine is very strong and mean and reliable-pulls hard,was built last summer and has about 20hrs on it-runs on royal purple syn.oil and is over maintained-also a very hot looking engine-with attention to detail-also comes with aftermarket sea pump and extras-can run it on a stand if needed.$22k into it-sacifice at $12000 email at [email protected]-i have been burnt on a used engine before so no worries of this being a bad engine.