292 ENGINE ASSEMBLY GMC GROUP 0 303 SPRING Valve 73 78 All 4 4 3735381 12 2 75 SPRING w damper I 8 0820A 0 306 SEAL SHIELD Valve Spring Cap 73 78 All 3835333 A R N L SEAL valve stem oil 8 0795 73 78 All 3836755 A Fl 43 SHIELD cup shape D x 1 0 0 8 0798A 0 309 CAP ROTATOR ASM Valve Spring 73 78 All 3729363 A R 82 CAP 1 1 0 D stamped X 8 0730A 73 78 All 6283794 A R 5 85 ROTATOR ASM exhaust 8 0730A 0 310 KEY Valve Stem 73 78 All 3947770 A R 41 KEY carhonitrided purple dye u 0 D x long 8 0740D 0 333 ARM Valve Rocker 73 78 All 5723551 12 N L ARM 8 0825A 0 386 COVER ASM Valve Rocker 73 All 6259798 1 18 60 COVER ASM 8 0620 74 76 All 380932 1 28 00 COVER ASM w grammet 8 0620 77 78 All 473333 1 25 75 COVER ASM 8 0620 0 413 BOLT REINFORCEMENT Valve Rocker Cover NOTE 1 Use with 180016 bolt 73 78 All 1800I6 1 28 BOLT 20 x 8 900 8 0875A 75 78 All 352173 A R 1 05 BOLT 8 0875A 73 78 All 3877670 A R 25 REINFORCEMENT 1 t 0 L Note I 8 0885A 75 78 All 352I72 Il 33 REINFORCEMENT 8 0865A 0 423 GASKET Valve Rocker Cover NOTE For 1977 78 use silicone rubber sealant Group 8 800 for engines with HTV formed in place gasket 73 78 All 3930912 I N L GASKET 8 0830A 0 426 ROD ASM Valve Push EJ 73 78 All 3788494 I2 3 50 ROD ASM I1 0 L black stripe 8 1060A 0 429 STUD BALL NUT Valve 73 78 All 3814692 A R I 10 STUD rocker arm ball 003 0 5 24 x 2 blue paint 8 1151A 73 78 All 3815892 A R 1 10 STUD rocker arm ball 0I3 U S 24 x 2 orange paint 8 115IA 73 78 All 3992294 I2 64 BALL die 8 0851A 73 78 All 3744341 A R 52 NUT valve rocker erm adj 24 8 0990A 78 All 465934 12 52 NUT vlv cooker arm edi 8 0990A 0 439 COVER Valve Push Rod and Cylinder Block 73 78 All 465810 2 4 05 COVER push rod 8 0920A 0 443 GASKET Valve Push Rod and Cylinder Block Cover 73 77 All 3858938 2 2 35 GASKET 8 0940A 0 446 BOLT STUD ASM Valve Push Rod Cover 73 78 All 3814350 6 55 BOLT w seal Vu I8 lt 8 0875A 75 78 All 352169 2 69 STUD ASM w Seal push rod cover 8 0875A 0 459 TAPPET Valve 1 73 78 All 5232450 12 6 65 TAPPET hydraulic type 8 0980 0 519 CAMSHAFT NOTE Engine Camshaft Break in Oil Group 1 850 should be used when installing new camshaft 73 78 All 3847998 I 105 00 CAMSHAFT ldent N0 3848000 8 1200 0 533 BEARING UNIT Camshaft Thrust 73 78 All 10000588 I 3 60 BEARING UNIT 8 1205A j WAFIEHOUSING AND D STRIBUT 0NDIVl l0N OF GENERAL MOTORS CORPORATION LT TRUCI 51 0 303 0 533 sms REV 2 83