305 ENGINE ASSEMBLY GMC GROUP 0 303 Con t 77 All Blazer Jimmy 6263796 8 2 80 SPRING w damper exhaust valve 8 0820A 0 308 SEAL SHIELD Valve Spring Cap 77 78 All Blazer Jimmy 3835333 A R N L SEAL valve stem oil 8 0795 J 77 78 MI Blazer Jimmy 3836755 A R 43 SHIELD cup shape I D x 1 0 D 8 0796A 0 309 CAP ROTATOR ASM Valve Spring 77 78 All Blazer Jimmy I 4003974 I6 82 CAP ll lt O D stamped A 8 0730A 77 78 All Blazer Jimmy 6263794 8 5 85 ROTATOR ASM exh valve B 0730A 0 310 KEY Valve Stem 77 78 All Blazer Jimmy 3947770 A R 41 KEY carbonitrided purple dye 0 D x long B 0740D 0 333 ARM Valve Rocker 77 78 All Blazer Jimmy 3974290 I6 N L ARM raised letter O on inside of pad end 8 0825A 0 386 COVER ASM GROMMET Valve Rooker Arm 77 78 All Blazer Jimmy 464655 L H 19 85 COVER ASM 8 0620 77 78 CK I 2 3 Blazer Jimmy l4025552 R I l 21 30 COVER ASM 8 0620 77 78 G 1 2 3 14025548 R H 21 30 COVER ASM 8 0620 77 All Blazer Jimmy 3894337 A R 33 GROMMET 1 I D x l 0 D 1 745 V 8 3235AM 0 413 BOLT REINFORCEMENT Valve Rucker Cover NOTE 1 Use with 180016 halt 77 All Blazar Jimmy 180016 1 28 BOLT 20 x I 8 900 8 0875A 78 CK1 2 Blazer Jimmy 305 480578 8 35 BOLT 20 x ln 8 0875A 77 All Blazer Jimmy 3877B70A R 26 REINFORCEMENT 1 0 L Note I 8 0665A 0 423 GASKET Valve Rocker Cover 77 All Blazer Jimmy 3933964 2 N L GASKET 8 0630A 0 426 ROD ASM Valve Push 77 78 All Blazer Jimmy 3796243 I6 N L ROD ASM 7 n 0 L blue stripe 8 1060A 0 429 STUD BALL NUT Valve 77 78 All Blazer Jimmy 3814692 A FI 1 10 STUD rocker arm ball 003 0 S I Z4 x 2 blue paint 8 1 5IA 77 78 All Blazer Jimmy 38I5892A R 1 10 STUD rocker arm ball 013 0 5 24 x 2 orange paint 8 I51A 77 78 All Blazer Jimmy 3959142 16 74 BALL dia 8 0851A 77 78 All Blazer Jimmy 374434 IA R 52 NUT valve rocker arm adj 24 8 0990A 0 459 TAPPET Valve 77 78 All Blazer Jimmy 5232720 16 N L TAPPET hydraulic type 8 0980 0 519 CAMSHAFT NOTE Engine Camshaft Break n OIL Group 1 650 should be used when installing new camshafts 77 78 All Blazer Jimmy 361995 1 l05 0 0 CAMSHAFT 8 I200 0 539 BEARING Camshaft Nu 1 Front 77 78 All Blazer Jimmy 474005 1 14 90 BEARING cm shf 1 8 I210A 0 543 BEARING Camshaft No 2 Front Intermediate 77 78 All 474006 2 14 85 BEARING am shf 2 rr 8 1210A 0 546 BEARING Camshaft Center or Rear Intermediate 77 78 All 474007 2 14 90 BEARING 34 4 8 12 0A 0 549 BEARING Camshaft Rear 77 78 All Blazer Jimmy 474006 1 I4 85 BEARING stamped 3723585 0 543 8 1210A 0 553 PLUG Camshaft Bearing Hole In Cyl Block 77 78 All Blazer Jimmy 3997752 1 33 PLUG rear 8 1360A J WAREHOUSING AND DISTRIBUTIONDIVISION OF GENERAL MOTORS CORPORATl0N LT TRUCK 51 i 0 303 0 553 0 28 REV 2 83