Outside Shaft Groove Fun Dia Dio No Width Stamped f 56 Ser 4 w 40 amp H D 8 cyl exc P S 56 59 Ser 6 w 40 45 50 amp H D 8cy1 exc P S 57 Ser 8 w 40 amp H D exc P S A O H B 58 59 Ser 5 w 45 50 amp H D exc P S A O H B 58 59 Ser 8 w 45 50 amp H D exc Air Equip 58 59 Ser 8 10 w 45 50 amp H D exc P S Yes 5 5 2 3732536 3732462 1 17 00 55 56 Ser 5 exc P S 40 45 50 amp 55 56 Ser 4 6 exc P S 40 amp 56 59 Ser 7 exc P S 40 45 50 amp 56 59 Ser 8 w Air Equip exc P S 40 45 50 amp 57 Ser 4 6 6 cyl exc P S 45 amp S8 59 Ser 5 6 w A O H B 8 cyl exc P S 40 45 50 amp 58 59 Ser 4 6 6 cyl exc P S 40 45 50 amp 60 62 Ser 50 60 6 cyl exc 35 40 50 amp L C I A C gen 60 62 TILT exc P S w 8 cyl 40 50 amp L C I A C gen N0 5 1 1942911 1942911 1 3 30 56 Ser 4 P S w 40 amp 8 cyl 2nd design 57 Ser 8 P S w 40 amp exc A O H B Yes 4 3 2 3732551 3732545 1 14 25 58 59 Ser 6 w P S 6 cyl exc 40 amp 58 59 Ser 4 5 7 w P S exc 40 amp 58 59 Ser 8 w Air Equip P S exc 348 40 amp Yes 4 2 1 4 3754101 1 3 30 58 59 Ser 7 8 9 348 exc 45 50 amp 58 59 Ser 10 w P S 348 59 Ser 7 348 exc P S 45 amp 59 Ser 8 w P S 348 No 5 1 1939887 1 10 30 59 Ser 4 6 w 40 amp 6 cyl 59 Ser 7 w 40 amp 283 59 Ser 8 w 40 amp Air Equip 283 60 61 Ser 50 60 w 40 amp 6 cyl exc TILT 60 61 Ser 60 TILT w 40 amp 6 cyl aaa P s Yes 4 4 1 3764624 1 3 50 59 Ser 7 283 w 60 amp alternator exc A O H B 60 61 Ser 40 thru 60 w 60 amp alternator exc A O l l B No 32 1 1945759 1 9 52 60 61 ser 40 w 40 amp Yes 3 1 3764627 1 3 50 60 62 ser 40 w 35 amp Yes 3 4 1 3754100 1 3 30 60 61 ALL w 40 amp 8 cyl No 4 2 3766997 3766997 1 9 75 60 61 ALL w 50 amp L C I 8 cyl Yes 35 3 2 3767013 3767012 1 14 65 60 Ser 60 thru 80 8 cyl exc TILT 40 50 amp L C I 60 TILT w P S exc 40 50 amp L C I 61 62 Ser 60 thru 80 8 cyl exc TILT 50 amp L C I A C gen 61 62 TILT w P S 8 cyl exc 50 amp L c 1 A c gen N6 5 2 3766991 3766991 1 9 75 60 61 ALL w 50 amp Yes 5 2 3766993 1 18 25 62 Ser 40 thru 60 w 42 S2 amp A C gen 6 cyl exc TILT 62 Ser 60 TILT w 42 52 amp A C gen 6 cyl exc P S f 63 64 Ser 50 60 292 exc P S 62 amp 130 amp 65 66 Ser 50 60 292 exc P S 62 amp 130 amp Air Cond N6 3 4 1 1 3815498 1 3 30 1966 Chevrolet Motor Division 205 2 274 General Motors Corporation HDI REVISED MARCH I I966