Patent ID: 7055485

Claim:
An internal combustion engine comprising a cylinder block journaling a crankshaft driven to rotate by a reciprocal piston, and a cylinder head having intake and exhaust passages for delivering a combustible fuel-air mixture to drive said piston and for exhausting the combustion products thereof, respectively, said cylinder block and said cylinder head being a single unitary monoblock member without opposing machined surfaces and a head gasket therebetween, wherein said engine is liquid cooled, said engine is cooled by liquid coolant in a cooling passage integrally formed with said cylinder head and said cylinder block all as a single unitary monoblock member, each of said intake and exhaust passages extends along a direct die pull path enabling direct die pull cores to integrally form said intake and exhaust passages with said cylinder head and cylinder block, said cooling passage extends along a direct die pull path enabling a direct die pull core to integrally form said cooling passage with said cylinder head and cylinder block, said exhaust passage and said cooling passage are die pulled in a common direction.