Abstract: Method and apparatus of manufacturing a synthetic resin tubular member having differently oriented inlet tube and outlet tube portions uses a pair of displaceable molding dies. One of the dies is rotatable relative to the other die. The molding dies have a core portion fitted to the tube end of one of the inlet and outlet tube portions and is slideable in a direction different from the direction in which the dies open and close. The method includes the steps of core insertion, die clamping, injection, die opening, core removal, ejection, and die rotation. Each time the molding die is rotated one step, a primary molding step, in which two molding halves of the tubular member are formed, and a secondary molding operation, in which the two molding halves are joined, are formed, so that a finished tubular member is obtained for each rotational movement of the molding dies.

Abstract: A structure is provided for connecting an intake tube to an intake port of a cylinder head of an internal combustion engine. The connecting structure includes a socket end portion of the intake port, a connecting end portion of the intake tube for insertion into the socket end portion of the intake port, and a seal ring interposed between the connecting end portion of the intake tube and the socket end portion of the intake port. The seal ring has a groove which is open outwardly away from the intake port.