Intake and exhaust structure for V-type engine

An outboard motor comprised of a powerhead having an internal combustion engine and a surrounding protective cowling, a driveshaft housing lower unit depending from said powerhead and containing a propulsion device driven by said engine for propelling an associated watercraft, said engine comprising a V-type 4-cycle engine comprising a pair of angularly disposed cylinder banks each containing at least one cylinder bore and defining a valley therebetween, cylinder heads affixed to said cylinder banks at one end of said cylinder bore and having at least exhaust passages formed therein extending from exhaust valve seats on the valley side thereof to exhaust outlet openings, exhaust valves supported in said cylinder heads for controlling the opening and closing of said exhaust valve seats, pistons reciprocating in said cylinder bores and driving a crankshaft journalled at the other end of said cylinder bores about a vertically disposed axis for driving said propulsion device, said exhaust outlet openings each opening into the valley between said cylinder banks, and an exhaust manifold for transferring exhaust gases from said exhaust ports down from said powerhead into said driveshaft housing and lower unit for discharge to the atmosphere.