supply DL 20 DL 22 DL 28 DL 40 DS 18A DS 22 cylinder head , our company is a large -power diesel engine spare parts ... manufactory ,the main products including cylinder liner ,cylinder head ,piston crown ,piston skirt ,valve housing ,valve seat & spindle ... etc.and it has 15 years and owns advaced high precision mechanical processing equipment .it is also capable of processing ...