Abstract: A cylinder head capable of improving a productivity of a cylinder head having an exhaust collecting portion and improving a cooling efficiency of the exhaust collecting portion is disclosed. An exhaust collecting portion 9 is surrounded by an upper side flow passage portion 15, a lower side flow passage portion 16 and extended flow passage portions 17 into which coolant flows through a coolant communication passage 26 from a lower portion side water jacket 12 that is opening in a cylinder block 2. The upper side flow passage portion 15 and the extended flow passage portions 17 are formed at a time of the molding along with an upper portion side water jacket 11 by a core for upper portion side water jacket 18, while the lower side flow passage portion 16 is formed by the drilling after the molding.

Abstract: A cylinder head capable of improving a productivity of a cylinder head having an exhaust collecting portion and improving a cooling efficiency of the exhaust collecting portion is disclosed. An exhaust collecting portion 9 is surrounded by an upper side flow passage portion 15, a lower side flow passage portion 16 and extended flow passage portions 17 into which coolant flows through a coolant communication passage 26 from a lower portion side water jacket 12 that is opening in a cylinder block 2. The upper side flow passage portion 15 and the extended flow passage portions 17 are formed at a time of the molding along with an upper portion side water jacket 11 by a core for upper portion side water jacket 18, while the lower side flow passage portion 16 is formed by the drilling after the molding.