427 ENGINE ASSEMBLY 0 659 BALANCER PULLEY Crankshaft Con t 66 67 All w C A C 427 exc Sp H Per T H 66 67 All w 62 amp C A C w T H 427 68 All w C A C 427 lst design exc T H 3874414 1 14 80 PULLEY 2 grooves 72 G4 0 D 66 All w 62 amp 427 exc Sp H Per Air Cond 66 67 All w A F l 427 exc Sp H Per Air Cond 68 All 427 exc C A C A T Sp H Per 3874418 1 13 60 PULLEY front 2 grooves 67 All A l R w Sp H Per 427 exc P S 67 All w 62 amp A C Gen 427 Sp H Per exc P S 3863108 1 48 75 PULLEY 2 grooves cast 68 All w Sp H Per 427 exc P S 3921923 1 14 50 PULLEY 2 groove stamped 68 All w P S 427 exc Sp V H Per 3925525 1 12 90 PULLEY front 1 groove 69 All 427 exc C A C P S Sp H Per 3955290 1 15 20 PULLEY 1 groove 69 All w Sp H Per 427 3955291 1 15 20 PULLEY 2 groove 69 All w Air Cond 427 exc A T 3937787 1 21 35 PULLEY 3 groove Note 1 0 662 WASHER KEY Harmonic Balancer and Crankshaft Pulley NOTE 1 Used with pulleys and hubs having a shallow I is deep keyway only All full depth slots take standard woodruff key 106751 two short or 144542 one long in group 8 960 66 69 All 427 3864814 1 1 05 WASHER balancer 66 All w key long x 3 G wide x 4 high 3883206 AR 31 KEY crankshaft pulley hub Note 1 66 All w key 13 B long x 3 ia wide x 32 high 3885092 1 28 KEY crankshaft pulley hub Note 1 0 666 FLYWHEEL Engine Crankshaft NOTE 1 On some application 3991401 and 3937736 are used optionally in production These parts can be identified by their bolt hole mounting patterns 3991401 contains a single bolt hole mounting pattern 1 1 in dia 3937736 contains two staggered bolt hole mounting patterns The inner pattern 1O 4 in dia 66 69 All 427 exc A T 3988759 1 114 00 67 All w T H 68 All w T H 427 1st design 69 All w T H 400 Sp H Per 427 361950 1 58 50 Note 1 68 All w T H 427 2nd design 69 All w T H 400 427 exc Sp H Per 340296 1 N L Note 1 69 All w T H 350 427 471529 1 39 25 FLYWHEEL 0 669 BOLT Flywheel to Crankshaft 66 69 All 427 exc A T 839756 6 25 7 16 20 x 1 66 69 All w A T 427 3727207 6 61 BOLT is 20 x 5 E4 290Nl steel 0 673 GEAR Flywheel Ring 66 69 All 427 3991408 1 10 90 GEAR 0 679 PAN COVER SCREW Flywheel NOTE 1 Use with washer 120393 group 8 929 66 69 All w T H 400 427 3868810 1 6 00 trans converter 68 69 All w T H 350 427 465471 1 7 85 PAN trans converter 66 69 All 427 3843943 1 5 05 COVER clutch housing All All 427 3817006 A R 18 SCREW w washer 20 x G 69 All w T l l 350 427 11501923 4 56 SCREW 5 is 18 x 9 la Note 1 66 69 All w P G 427 3924780 A R 28 SCREW w washer 5 6 18 x 7 B 0 683 HOUSING BOLT Flywheel and Clutch NOTE 1 When using Bolt 3736035 it will be necessary to use washer 120394 8 929 66 68 All 427 exc A T 69 All 427 exc reg fuel 3899621 1 64 50 HOUSING clutch All All 427 3736035 A R 61 BOLT clutch housing attach VB 16 x 15 16 300l l steel plain 3 275 Note 1 All All 427 3733130 2 65 BOLT clutch housing attach V8 16 x 2 4 washer hd 300M steel 3 275 GIVI PARTS DIVISION GENERAL MOTORS CORPORATION CHEVROLET 11 REV 4 81 0 117 0 659 0 683