GSO ISO 1204:2013
更换内燃机 气缸和气缸盖中阀门的旋转方向的指定 生产线和发动机中左右定义以及发动机上的位置
Reciprocating internal combustion engines -- Designation of the direction of rotation and of cylinders and valves in cylinder heads, and definition of right-hand and left-hand in-line engines and locations on an engine