250 ENGINE ASSEMBLY GMC GROUP 0 459 C n t 78 Cl 03 250 exc H D C F44 78 GI 250 78 C2 03 250 J 78 G2 3 250 5232720 I2 N L TAPPET hyd vlv 4 8 0980 0 519 CAMSHAFT NOTE Engine camshaft Break in Oil Group LB50 should be used when installing new camshafts 73 74 All Blazer Jimmy 75 78 C 1 Sub 75 78 K I Blazer K Jimmy K 75 78 C I Cab w H D Chassis 76 78 Blazer C Jimmy C 3864497 I 83 75 CAMSRAFT 8 1200 75 78 C I Cab exc H D Chassis 75 78 G I 78 C2 03 250 78 G2 3 250 75 Blazer C Jimmy C 6262809 1 93 75 CAMSHAFT 8 1200 0 533 BEARING UNIT Camshaft Thrust 73 78 All Blazer Jimmy I 0000568 I 3 60 BEARING UNIT 8 1205A 0 539 BEARING Camshaft No 1 73 78 All Blezer Jimmy 14002525 4 4 90 BEARING No I 2 3 4 8 1210A 0 553 PLUG Camshaft Bearing Hole in cyl block 73 78 All Blazer Jimmy 3994255 I 53 PLUG rear ste s 2 dia x J thk 8 1360A 0 603 ROD ASM Connecting 73 78 All Blazer Jimmy 370798 I 32 25 ROD ASM 8 1840A 0 616 BEARING UNIT Connecting Rod GMC 6 18608 V NOTE Unit consists of one upper and one lower bearing 73 74 All Blazer Jimmy 463258 A R 5 55 BEARING UNIT std 818608 73 74 All Blazer Jimmy 3715046 A R 9 05 BEARING UNIT 002 U S 818808 73 74 All Blazer Jimmy 3715044 A R 8 10 BEARING UNIT 010 U S 818608 75 78 All Blazer Jimmy 463258 A R 5 55 BEARING UNIT std 8 18608 73 78 All Blazer Jimmy 463319 A R 6 95 BEARING UNIT 001 U S 8 18608 75 78 All Blazer Jimmy 463320 A R 6 85 BEARING UNIT 002 U S 8 18808 75 78 All Blazer Jimmy 3715044 A R 6 IO BEARING UNIT 0l0 U S 8 18608 73 78 All Blazer Jimmy 37 5047A R 9 05 BEARING UNIT 020 U S 8 18608 0 623 BOLT Connecting Red Bearing Cap 73 75 All Blazer Jimmy 3882670 12 1 75 BOLT 8 1870A 78 78 All Blazer Jimmy 460405 I2 1 75 BOLT 8 1870A 0 626 NUT Connecting Rod Bearing Cap Bolt 73 78 All Blazer Jimmy 527589 12 55 NUT t 24 spec hex 8 1900A 0 629 PlS 0N ASSEMBLY with Pin Refer te Piston Chart for model application GMC 8 19208 NOTE Individual piston assemblies are available for warranty purposes and for replacement of pistons damaged when making repairs to engine assemblies When ordering such pans it is necessary that you specify on your order the reason the parts are required and also that the following Note appear on your order Do not ship unit package quantity 73 78 All Blazer Jimmy exc L P Gas 6270033 6 36 00 PISTON std 8 18208 73 78 All Blazer JimmV exc L F Gas 6270034 6 38 00 PISTON 8 18208 73 78 All Blazer Jimmy exc L P Gas 6270036 6 36 00 PISTON 819208 0 643 RING UNIT Piston Service Sets GMC 8 19508 Original Equipment Type Complete set for one cylinder per container WAREHOUSING AND DISTRIBUTIONDIVISION OF GENERAL MOTORS CORPORATION LT TRUCl 5l 0 459 0 643 0 8 REV 2 83