58 ALL 348 lst design Q 20 O L not used w spark plug cooling 3754081 2 1 05 f S8 61 ALL 348 2nd design 20 O L used w spark plug cooling 3758383 2 1 01 59 62 ALL 261 l 27 O L 3760990 1 2 45 62 65 ALL 348 409 20 O L 3814003 2 1 01 62 66 ALL 159 212 318 water hole cover 5116242l A R 05 63 66 Ser 50 60 230 250 292 28 O L 3869196 1 2 42 65 66 ALL 351 2453449l 2 3 20 65 66 ALL 478 24722050 2 3 60 66 ALL 366 22 0 L 3872798 2 2 60 55 56 Ser 4 5 6 265 lst design GASKET UNIT 3711846 T l 5 95 55 56 ALL 265 2nd design GASKET UNIT 3733879 T 1 6 15 55 62 ALL 235 GASKET UNIT 3709428 1 4 70 55 58 ALL 261 GASKET UNIT 3751893 1 4 85 NOTE When using on jobs after 1956 it is als o necessary to use 3731062 exhaust pipe sealing ring and discard 3692831 exhaust pipe flange gasket 56 59 ALL 322 GASKET UNIT 1392707 1 8 15 NOTE Unit consists of gaskets for cyl heads water manifolds intake manifolds valve covers and water manifold O ring NOTE When using 3760518 inlet gasket on School Buses the two 2 holes in the cross over area must be enlarged to 54 diameter 59 Ser 4 6 w L D 283 60 61 Ser 40 50 283 GASKET UNIT 3819423 T 1 6 20 59 62 ALL 261 GASKET UNIT 3764410 1 4 85 S8 65 ALL 348 409 GASKET UNIT 3825191 T 1 6 40 57 59 ALL 283 exc L D 60 61 Ser 60 283 62 66 Ser 40 50 60 283 327 GASKET UNIT 3819424 T I 6 40 62 66 Ser 60 212 GASKET UNIT 51965796l 1 9 06 62 66 ALL 159 318 GASKET UNIT 51965786l 2 7 55 63 66 Ser 50 230 250 GASKET UNIT 3870818 0 I 6 15 ONOTE It may be necessary to cut out the center ribs from exhaust port opening of inlet and exhaust manifold gasket 63 66 Ser 50 60 292 GASKET UNIT 38708l9 A 1 6 15 ANOTE It may be necessary to cut off the six 6 locating tabs of the valve rocker cover gasket 66 ALL 366 GASKET UNIT 3900944 1 14 15 l 62 66 Ser 60 212 RING seat large 5116293l 1 2 57 62 66 ALL 159 318 RING seal large 5116292l 2 2 37 62 66 ALL 159 212 318 RING water seal 511629 W A R 17 62 66 ALL 159 212 318 RING oil seal 5116122l A R 17 62 65 ALL 159 212 318 66 ALL 159 318 RING ctr water hole seal 5121207l A R 22 Not required in this group See group 3 304 RING 5160037l 13 TNOTE Unit consists of gaskets for cylinder heads rocker covers intake and exhaust manifolds carburetor distributor air cleaner water outlet and valve stem oil seals NOTE Units consist of cyl head rocker cover push rod cover manifold thermostat housing and water outlet gaskets exhaust pipe packing and valve stem oil seals GNOTE Unit consists of RINGS for cyl head water seal cyl head oil seal cyl head seal large center water hole seal water by pass thermostat hsg Also includes GASKETS for blower drive support and gov hsg water hole cover and therm hsg rocker cover exhaust manifold gov control hsg cover 0 293 BOLT PIN STUD NUT CUP COVER NOZZLE PLUG CONNECTOR BRACKET WASHER Cylinder Head 55 59 ALL 6 cyl 13 x 4 drilled 3764578 T I 55 TNOTE Required when any 1959 6 cyl block or short motor is installed in 1955 58 models Reduces full pressure oiling to restricted flow Also requires PLUG 3764579 in group 1 531 at right hand center bolt location 55 62 ALL 6 CYL X DIESEL 10ng Z 13 x 4762 raised circle on hd 3835811 A R 45 55 62 ALL 6 cyl exc DIESEL short 13 x 3 raised circle on hd 3835812 A R 35 55 66 ALL 8 cyl exc 322 348 366 409 long Z 14 x 3 3734594 18 15 1966 Chovrolot Motor Division 87 0289 0293 G n r Motors Corporation HUT REVISED MAY I I966