ENGINE SERIES NUMBER AND SUFFIX CHART Cont i I ype Type Model Description Designation Model Description Designation C 50 S 50 Allison Auto WF C 50 S 50 C 60 M 60 Allison Auto YH C 50 S 50 Manual Trans WX 0 50 S 50 M 50 c 60 M 60 Manual Trans YI C 50 S 50 Allison Auto WY T 60 Allison Auto YJ T 50 T 60 Manual Trans XK T 50 T 60 Manual Trans YK T 50 Q Manual Trans XV V 366 8 CYLINDER 427 8 CYLINDER C 50 S 50 M 50 Allison Auto YA C 60 M 60 Manual Trans YT M 60 p Manual Trans YB T 60 Manual Trans YU T 50 T 60 Manual Trans YC C 60 M 60 Manual Trans YV T 60 Allison Auto YD T 60 Manual Trans YW GM PARTS DIVISION GENERAL MOTORS CORPORATION CHEVROLET 72TM 1 33