64 Pass 6 cyl 3920988 1 w oil seal 42 62 Pass 6 cyl 3770308 8 BOLT w washer cover attaching V4 20 x Vm 42 62 Pass 6 cyl 58 Pass 348 3770309 A R BOLT w washer cover attaching V4 2O x 62 Pass 283 327 3817006 10 BOLT V 20 x Vw ext Iockwasher 0 679 39 62 Pass 6 cyl 3835842 1 LOCK frt cover bolt 55 62 Pass 8 cyl 3836732 2 PIN dowel 005 O S O 738 55 64 Pass 8 cyl 3836903 2 PIN dowel Vt x 0 738 0 207 GASKET Crankcase Front End Cover 38 62 Pass 6 cyl 838206 1 12 attach holes 55 64 Pass 8 cyl exc 348 409 3799620 1 attach 2 dowel holes 58 64 Pass 348 409 3799600 1 fiber and rubber 12 holes 63 64 Pass exc 8 cyl 3923472 1 0 213 SEAL Crankcase Front End Cover 38 64 Pass 3835946 1 ZV O D stamped 3835946 0 269 HEAD Cylinder 50 52 Pass 235 3835908 1 w valve guides ldent No 3835909 53 62 Pass 235 3836954 1 w valve guides ldent No 3836848 also see Notes 1 thru 4 NOTE 1 838539 Seat must be used on jobs w o hydraulic valve lifters NOTE 2 PartNo 838539 is not required if replaced head has spring seats which can be transferred NOTE 3 When using on 1960 thru 62 Pass it is necessary to drill and tap a 18 hole in cyl hd bosses for attaching air cond unit NOTE 4 On 1953 thru 1955 models with Bourdon tube type heat indicator gauge it is also necessary to use Adapter Bushing 3837160 55 Pass 8 cyl 56 Pass w 2BC 3773010 2 w valve rocker studs ldent No 3767460 3773012 Note 5 NOTE 5 Used with 3850089 valve rocker cover unit 56 Pass w 4BC exc dual 4BC 3729785 2 w valve rocker studs ldent No 3725306 small ports 56 59 Pass 8 cyl exc 2BC Air S 58 59 Pass w Air S 2 right 60 61 Pass w 4BC 62 64 Pass 327 exc H Per F l Sp H Per 63 64 Pass 283 3817680 2 right and left ldent No 3795896 Note 6 NOTE 6 When using 3817680 on 1957 1958 models it will also be necessary to use cyl head gasket 3830711 57 62 Pass w 2BC 265 283 3958602 2 w studs 58 Pass 348 exc water cooled plugs 58 60 Pass w water cooled plugs 348 exc H Per 61 Pass w water cooled plugs 348 exc H Per w reg cam Sp H Per 3759254 2 ldent No 3759256 59 60 Pass w H Per 348 3785086 2 ldent No 3758379 or 3767738 Note 7 NOTE 7 When used on engines not equipped with valve stem oil shields it is imperative that valve spring shim 3764539 be used to compensate for the 030 of extra space 60 61 Pass w Sp H Per 348 61 Pass H Per w reg cam 348 63 64 Pass 409 exc H Per dual 4BC 3839747 2 ldent No 3830817 62 64 Pass w H Per 327 3958603 2 w studs 61 64 Pass w H Per dual 4BC 409 exc RPO Z11 3852582 2 ldent No 3852483 Note 8 9 NOTE 8 Used only with camshaft 3830690 valve spring 3817277 and shim 3853875 on 1964 models with engine date stamps prior to T1118 OA and T1118 OB Used only with camshaft 3837735 and valve spring 3858367 on 1964 models with engine date stamps subsequent to T1118 QA and T1118 OB lt is necessary to use shim 3853875 on 1961 to 1963 models For further information refer to CHEVROLET Service News Volume 36 No 6 June July 1964 NOTE 9 Do not use on early design 1961 409 engines 63 64 Pass 230 3938931 1 w studs Note 10 NOTE 10 Pipe plug 444746 or 444788 is to be discarded when water temp switch is mounted in cylinder head t 1970 CHEVROLET MOTOR DIVISION GENERAL MOTORS CORPORATlON P A 30 0 206 0 269 0 6