0 646 CRANKSHAFT 48 53 All 216 3835270 1 108 55 ldent No 3835271 54 62 All 6 cyl 63 4 WD 6 cyl 1st Ser 3701486 1 106 00 ident No 3701488 Note 1 57 67 All 283 3889303 1 104 20 Note 1 t 63 65 All 153 3793080 1 83 90 Note 1 63 69 All 194 230 3864465 1 112 35 Note 1 68 70 All 396 3882841 1 112 50 Note 1 65 67 All 327 3889305 1 1 15 00 66 All w T H 292 67 70 All 292 3910362 1 111 40 Note 2 NOTE 2 When using on models w T H it will be necessary to use Flywheel 3910369 6 flywheel Bolts 3910368 and 3 dowel Pins 3888062 66 70 All Blaier 250 3876840 1 99 15 Note 1 67 70 All 3 53 5116447 1 348 14 68 All 327 3914682 1 112 90 Note 1 68 All 307 3930809 1 102 25 Note 1 69 70 All Blazer 307 3941172 1 105 30 Note 1 69 All Blazer 350 exc light duty 70 All w L P Gas 350 3941180 1 107 10 Note 1 69 All w light duty 350 70 All Blazer 350 exc L P Gas 3932444 1 107 10 Note 1 63 66 All 292 exc A T 3909427 1 138 45 CRANKSHAFT UNIT w flywheel Note 3 63 66 All w P G 292 3914064 1 178 00 CRANKSHAFT UNIT w flywheel Note 3 NOTE 3 Includes crankshaft flywheel dowel pins and flywheel bolts NOTE 1 When used on A T it will be necessary to remove the pilot bearing 0 649 BEARING Crankshaft Clutch Pilot 38 39 All 907321 1 3 03 ND 7109 2 l D x 1 z O D x Wu 39 70 All exc 3 53 3752487 1 95 bush type z l D x 1 gz O D x 0 659 BALANCER PULLEY HUB KEY Crankshaft NOTE Crankshaft harmonic balancer is also referred to as torsional damper 41 52 All 216 605203 1 15 65 cast 838863 3 width thru hub 6Vz dia Note 1 50 52 All 235 3701930 1 16 65 weight 7V O D pulley V Note 1 53 D D exc P S 54 55 Comm 1st Series 3704338 1 16 65 weight 7V O D puIIey V Note 1 55 Ser 3 6 cyl 2nd Ser 56 62 All 6 cyl 63 4 WD 6 cyl 1st Ser 3714444 1 15 55 stamped T Note 1 55 68 All 265 283 307 3896904 1 w o pulley hub 4Vz O D 60 62 All w Cool Pack 6 cyl 3772879 1 17 05 w pulley used w units 985323 988193 62 All w 62 amp AC gen 6 cyl 63 4 WD 6 cyl 1st Ser w 62 amp AC gen 3740518 1 22 50 w pulley double hub 7 dia 63 67 Ser 20 30 D D 292 3857352 1 21 85 w pulley double 6 0 D 63 67 All 194 230 3826280 1 14 60 w pulley timing mark on frt face 30 degree left 63 67 Ser 10 thru 30 292 exc D D 68 70 All 292 3980230 1 24 05 w pulley double 68 70 All 396 3860008 1 19 25 w ci pulley 7Vr 0 D 65 68 All 327 3894331 1 20 35 w ci pulley 12 Vu holes in weight drill pin balanced torsional 66 70 All Blazer 250 68 69 All 230 3896590 1 14 40 w I groove pulley 69 70 All Blazer 307 3947706 1 16 80 69 All w light duty 350 70 All w L P Gas 350 3947701 1 18 85 69 All 350 exc light duty 69 70 All Blazer 350 exc l P Gas 3947704 1 22 35 55 61 All 8 cyl 62 All 8 cyl exc 62 amp 63 4 WD 283 1st Ser exc 62 amp 3742991 1 1 85 PUlLLEY stamped 3742991 1 groove 6Vz O D x z thk 12 holes 62 All w 62 amp 283 63 4 WD 283 1st Series w 62 amp 3858533 1 3 30 PULLEY stamped 3858533 2 groove 6 O D x 1V thk 9 holes 63 65 All 153 3793717 1 2 75 PULLEY stamped 3793717 1 groove 12 holes 63 65 All w 62 amp 153 3790327 1 2 60 PULLEY front stamped 3790327 1 groove 6 z Cl D 12 holes 63 67 All 194 230 1971 CHEVROLET MOTOR DIVISION GENEFlAL MOTORS CORPORATION P A 31 i REV 6 71 0 19 0 646 0 659