65 66 ALL 478 INSERT 24541340 9 3 95 56 58 ALL 322 s PLUG cyl head core hole 663032 A R 15 0 269 HEAD Cylinder Z 55 62 ALL 235 Ident No 3836848 83695411 1 56 40 NOTE 838539 Seat must be used on jobs w 0 hydraulic valve lifters TNOTE On 1953 thru 1955 models with Bourdon tube type heat indicator gauge it is also necessary to use Adapter Bushing 3837160 6NO l E Part 838539 is NOT required if replaced head has spring seats which can be transferred 55 62 ALL 261 Ident No 3836850 3836963 1 56 40 55 56 ALL 265 w valve rocker studs Ident No 3703523 3773011 A 2 40 90 ANOTE When using 3773011 it will be necessary to use 3850049 valve rocker cover unit 56 59 ALL 322 w guides less studs and dowels Ident No 1175109 1175814 2 63 25 57 59 ALL 283 60 66 Ser 60 283 327 w valve rocker studs Ident No 3774684 3877068 2 42 00 NOTE Extreme care should be exercised when selecting replacement Inlet and Exhaust Valves for 1963 Ser 60 327 cu in Engines Approximately 1200 Cylinder Heads were used in production which have one 1 or more 003 O S Valves These Cylinder Heads may be identified by the numeral 3 stamped directly below the casting number NOTE On 1957 1959 models it will be necessary to use 1 3850049 valve rocker cover unit 58 ALL 348 Ident No 3758021 3758742 2 51 50 59 61 ALL 348 w valve rocker studs Ident No 3815857 3815856 2 51 50 60 66 Ser 50 283 w valve rocker studs Ident N0 3814480 3817682 2 42 00 62 64 Ser 60 212 519796 Cl 1 204 02 62 64 Ser 80 318 5197951l 2 175 97 62 65 ALL 348 409 w valve rocker studs Ident No 3819333 3820640 2 58 50 A NOTE Exhaust Valve Rotator 3819334 is used with this Head Assy in late 7 1962 production When using this Head Assy as replacement on early 1962 production models the old Exhaust Valve Rotator 3735275 can be used but Valve Spring Shim 3764539 must be used to obtain the correct valve spring height 63 66 ALL 230 250 292 w studs 3887862 1 53 25 65 66 ALL 351 lessvalves 24597420 1 98 00 65 66 ALL 478 less valves 24597460 1 106 00 65 66 ALL 351 w valves 24597440 2 152 00 65 66 ALL 478 w valves 24597480 1 168 00 65 66 ALL 159 318 5198203l A R 175 97 I 65 66 ALL 212 51982 Hl 1 204 02 66 ALL 366 3856212 2 55 00 0 283 GUIDE Inlet and Exhaust Valve Stem 55 62 ALL 6 cyl exc DIESEL inlet B4 l D x A6 O D 3708168 T 6 66 55 62 ALL 6 cyl exc DIESEL exhaust TA6 length st raight sides 3688761 T 6 61 56 59 ALL 322 inlet and exhaust non precision type ream in place I D x O D x 2 long 1362589 16 71 62 66 ALL 159 212 318 511612 Cl A R 56 TNOTE To obtain proper valve stem clearance guides must be finished with 343 hand reamer after installation in cylinder head 0 289 GASKET GASKET UNIT RING Cylinder Head 55 62 ALL 235 27 O L 3701296 1 2 23 55 66 ALL 265 283 327 19 O L X6 dia hole 3830711 2 1 16 55 58 ALL 261 27 O L 3750625 1 2 45 56 59 ALL 322 stamped 1165307 1165307 2 1 36 sf 1966 0 253 0 289 86 Chevrolet Motor Division HDT General Motors Corporation REVISED MAY l 1966