1 I 250 ENGINE ASSEMBLY I l I I 0 102 CAP Cra nkshaft Rear Intermediate Bearing See Group 0 095 for Model Application 1 I 0 103 BEARING UNIT Crankshaft Rear Intermediate 1 Upper and 1 Lower I See Chart following Group 0 096 for Model Application NOTE See Dealer Price Schedule P A 26 for applicable prices I 0 105 CAP Crankshaft Rear Bearing NOTE 2 3791428 will fit some 1968 6 cyl engines which have a date stamp of FO623 and also have an R stamped under the date Q V 88 72 All Blazer 250 3928975 1 Note 2 L I 0 106 BEARING UNIT Crankshaft Rear 1 Upper and 1 Lower J See Chart following Group 0 096 for Model Application I NOTE See Dealer Price Schedule P A 26 for applicable prices T g 0 137 SEAL Crankshaft Rear Bearing and Cap Oil I 1 V NOTE 1 Use 3958001 on 1967 engines with date stamp FO619 thru end of production 68 72 All Blazer 250 473424 2 66 67 All 250 3792463 1 SEAL UNIT upper and lower Note I 0 1 53 SHIM UNIT Crankshaft Bearing Cap 66 72 All Blazer 250 391 1010A R front and intermediate 88 67 All 250 3791429 A R rear 1 u O L 68 72 All Blazer 250 I 3928985 A R rear 0 206 COVER Crankcase Front End 88 87 AII 250 l I I 88 72 AII Blazer 250 I 7 3998816 1 COVER ASSY 0 207 GASKET Crankcase Front End Cover I 66 72 All Blazer 250 3923472 1 I A 0 213 SEAL Crankcase Front End Cover 66 72 All Blazer 250 3980267 1 crankshaft front oil V 0 269 HEAD Cylinder l NOTE 1 Pipe plug is to be discarded when water temp switch is mounted in cylinder head 88 72 All Blazer 250 8259893 1 w studs Note 1 I 0 289 GASKET GASKET UNIT Cylinder Head NOTE 1 On D D models it will be necessary to discard water outlet gasket 3701777 and replace it with 3789539 NOTE 2 It may be necessary to cut off the 6 locating tabs of the valve rocker cover gasket NOTE 3 It may benecassary to cut out the center ribs from the exhaust part opening of the inlet and exhaust manifold gasket NOTE 4 Unit consists of 1 Cylinder head gasket 1 Water outlet gasket 1 Valve rocker cover gasket 2 Push rod cover gaskets 1 Inlet and exhaust manifold gasket 1 Thermostat housing gasket 1 Exhaust pipe packing and 12 Valve stem oilseals i 66 72 All Blazer 250 355754 1 66 72 All Blazer 250 345030 1 GASKET UNIT Note 1 2 3 4 A 0 293 BOLT Cylinder Head A I A 66 72 All Blazer 250 3788417 A R 2 13 x 3 1 GM PARTS DIVISION GENERAL MOTORS CORPORATION CHEVROLET 72TL REV 5 79 V B 0 27 0 102 0 293