ENGINE SERIES NUMBER AND SUFFIX CHART Cont 2 Type RPO Model Description Designation No J S60 327 l 8 Cyl with 130 Amp YI l 30 S60 327 8 Cyl with Powermatic and 130 Amp YJ L30 S60 327 8 Cyl with Air Brake and 130 Amp YK L30 S60 327 8 Cyl with Powermatic Air Brake and 130 Amp Q YL L30 C60 L60 M60 S60 RPO I 39l C80 L80 M8C 348 8 Cyl YM STD T60 RPO L39 T80 348 8 Cyl Y0 STD C60 S60 RPO L39 C80 M80 348 8 Cyl with Powermatic YP STD T80 348 8 Cyl with Powermatic L YQ STD C80 L80 M80 409 8 Cyl QD L40 T80 409 8 Cyl QE L40 C80 M80 409 8 Cyl with Powermatic QJ L40 D50 3 53N 3 Cyl 2 Cycle Diesel Q 3D STD D60 X60 Y60 4 53N 4 Cyl 2 Cycle Diesel 4D STD E80 U80 W80 6 53N 6 Cyl 2 Cycle Diesel 6D STD N50 050 D351 6 Cyl 4 Cycle Diesel STD A60 N60 O60 V60 0478 6 Cyl 4 Cycle Diesel STD A60 N60 Q60 V60 DH478 6 Cyl 4 Cycle Diesel L53 0682 A80 N80 Q80 V80 DH478 6 Cyl 4 Cycle Diesel s STD Note Engines are stamped with a source production date and type on serial pad 1966 C50 S50 250 6 Cyl Q TM I 50 P50 250 6 Cyl T0 T50 250 6 Cyl TP C50 S50 250 6 Cyl with 4 Speed Trans TR l50 250 6 Cyl with 4 Speed Trans TS C60 M60 S60 292 6 Cyl UA L60 292 6 Cyl UC T60 292 6 Cyl UD C60 M60 S67 292 6 Cyl with Air Equip UF Y L60 292 6 Cyl with Air Equip UG C10 20 30 K10 20 292 6 Cyl UH C60 S60 292 6 Cyl with Powermatic UJ C60 S67 292 6 Cyl with Powermatic and Air Equip UK C60 M60 S60 292 6 Cyl with 4 Speed Trans H D l CUL T60 292 6 Cyl with 4 Speed Trans H D l UM L60 292 6 Cyl with 4 Speed Trans H D l UN L60 292 6 Cyl with 4 Speed Trans H D l and Air Equip UO C60 M60 S67 292 6 Cyl with 4 Speed Trans H D l and Air Equip UP l 50 P50 292 6 Cyl UW C50 S50 292 6 Cyl UY T50 292 6 Cyl Q UX C50 S50 292 6 Cyl with 4 Speed Trans H D l UZ L50 292 6 Cyl with 4 Speed Trans H D l VS l 50 283 8 Cyl Wl C50 I 283 8 Cyl WJ T50 283 8 Cyl WK C50 283 8 Cyl with 3 Speed Automatic Trans WD C50 283 8 Cyl with 4 Speed Trans lH D WN l 50 283 8 Cyl with 4 Speed Trans H D l WO C60 M60 S60 327 8 Cyl YW L60 327 8 Cyl YM T60 327 8 Cyl YN C60 S60 327 8 Cyl with Allison Automatic Y0 C60 M60 S60 372 8 Cyl with Air Equip YE L60 327 8 Cyl with Air Equip YF C60 S60 327 8 Cyl with Allison Automatic and Air Equip YP S60 327 8 Cyl with 130 Amp YI S60 327 8 Cyl with Allison Automatic and 130 Amp YJ S60 327 8 Cyl with 130 Amp and Air Brake YK S60 327 8 Cyl with Allison Automatic 130 Amp and Air Brake YL C60 L60 M60 S60 T60 C80 L80 M80 T80 366 8 Cyl YA C60 S60 C80 M80 366 8 Cyl with Allison Automatic YG GM PARTS DIVISION GENERAL MOTORS CORPORATlON CHEVROLET 72TM 30