ENGINE SERIES NUMBER AND SUFFIX CHART Cdnl Type Type Model Description Designation Model Description Designation C 50 S 50 Allison Auto WF c so s so c so M 60 Allison Auto YH C 50 S 50 Manual Trans WX C 50 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 1 60 Manual Trang YK T 50 Manual Trans XV 366 8 CYLINDER 427 8 CYLINDER C 50 S 50 M 50 Allison Auto YA C 60 M 60 Manual Trans YT M 60 Manual Trans YB T 60 Manual Trans YU T 50 T 60 Manual Trans YC 2 60 M 60 Manual Trans YV T 60 Allison Auto YD T 60 Manual Trans YW 197O CHEVROLET MOTOR DIVISION GENERAL MOTORS CORPORATlON P A 3TS 3T