HP 500 complete drop in this is a new gen 6 502 block/ nos o88 heads new crane valve springs/locks/ret. new srp std pistons file fit rings /felpro marine gaskets/gm dimple rods/gm steel crank balanced/melling oil pump m307/e coated merc oil pan/nos merc blue carb/new merc oil system includes oil cooler thermostat filter mount and all new hoses/new starter/ome merc exaust manifolds with long tails always used in fresh water /just need to add boat $16500.00 just has run time oo pallet .