454 ENGINE ASSEMBLY GMC GROUP 0 423 Con NOTE For 1977 78 use silicone rubber sealant lGrp 8 300 for engines with RTV farmed in place gasket 73 76 All M H C 3860315 2 N L GASKET 4 4 4 4 8 0630A 0 426 ROD ASM Valve Push 7174 C I 7174 C 2 Sub 75 78 All M H C 348280 8 2 70 ROD ASM Inlet 8 1060A 73 74 C 1 7174 C 2 Sub 75 78 All M H C 346282 8 2 70 ROD ASM exhaust dia 8 1060A 73 74 C 2 Cab 73 74 CP 3 M H C 3946067 8 3 70 ROD ASM inlet 8 1060A 73 74 C 2 Cab 73 74 CP 3 M H C 3946069 8 3 70 ROD ASM exhaust 8 I 050A 0 429 STUD BALL NUT Valve 7178 All M H C 3921912 I6 I I5 STUD valve rocker arm ball 8 1151A 73 78 All M H C 5232762 16 82 BALL rocker arm 8 085IA 73 78 All M H C 3896648 16 52 NUT valve rocker arm adi 20 8 0980A 0 439 GUIDE Valve Push Rod and Cylinder Block 73 74 C I 7174 C 2 Sub 75 78 All M H C 3904378 8 2 75 GUIDE 8 0975 73 74 C 2 Cab 73 74 CP 3 M H C 3860038 8 1 85 GUIDE 8 0975 0 459 TAPPET Valve 73 78 All M H C 5232700 16 5 95 1 APPET 8 0980 0 519 CAMSHAFT NOTE Engine Camshaft Breel in Oil Group 1 850 should be used when installing new camshaft 73 75 All M H C 353040 I 114 00 CAMSIIAFT 8 I200 76 78 All M H C 3963544 I 132 00 CAMSIIAFT 8 I200 0 539 BEARING Camshaft No 1 Front 73 78 AI M H C 3967808 1 5 l0 BEARING stamped I 8 1210A 0 543 BEARING Camshaft No 2 Front Intermediate I 7178 All M H C 3967810 2 5 05 BEARING stamped 2 8 1210A 0 546 BEARING Camshaft Center or Rear Intermediate 73 78 All M H C 3967809 2 5 10 BEARING stamped 3 4 8 1210A 0 549 BEARING Camshaft Rear 7178 All M H C 3967810 I 5 05 BEARING stamped 2 0 543 8 I210A 0 553 PLUG Camshaft Bearing Hole in cyl block 1178 All M H C 3999200 1 40 PLUG rear steal 2 u dia x thk 8 1360A 0 603 ROD ASM Connecting 73 78 All M H C 14015328 8 36 50 ROD ASM 8 1840A 0 616 BEARING UNIT Conneotlng Rod GMC 8 18608 NOTE Unit consists of one upper and one lower bearing 73 78 All M H C 347002 A R N L BEARING UNIT std 8 18608 7178 All M H C 347003 A Fl 9 05 BEARING UNIT 001 U S 8 18608 73 78 All M H C 347004 4 R IO 20 BEARING UNIT 002 U S 8 18608 73 78 All M H C 347005 A R 10 95 BEARING UNIT 010 U S 8 18608 7178 All M H C 347008 A Fl I5 10 BEARING UNIT 030 U S 8 18608 0 623 BOLT Connecting Rod Bearing Cap 7178 All M H C 3862720 IB 1 25 BOLT 24 x 2 H knurlcd shank 8 I870A 0 626 NUT Connecting Rod Bearing Cap Bolt 73 78 All M H C 3866786 A R 33 NUT 24 x thlck hex head 8 1900A WAREHDUSING AND DISTRIBUTIONDIVISION OF GENERAL MOTORS CORPORATlDN LT TRUCK 51 REV 2 83 Ms 0 423 0 626