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The date code on a generator is simple to decode. It includes the year, month and day such as 7K25. This decodes to 1967, October, 25th. Month codes are A through M for January through December (omitting the letter 'I').
A - January D - April G - July K - October
B - February E - May H - August L - November
C - March F - June J - September M - December
1964 - 283/327
ACCESSORIES NUMBER AMPS
A/C only 1100665 55
standard 1100668 37
optional 42 amp 1100669 42
optional 62 amp 1117765 62

1965 - 283/327/396
ACCESSORIES NUMBER AMPS
standard 1100693 37
A/C and optional 55 amp (RPO K77) 1100694 55
optional 42 amp (RPO K79) 1100696 42
optional 60 amp 1100697 60
optional 62 amp (RPO K81) 1117765 62

1966 - 283/327/396
ACCESSORIES NUMBER AMPS
standard (stamped "CB") 1100693 37
optional 42 amp (std w/396/375 and transistor ign - RPO K79) 1100696 42
A/C and optional 61 amp (RPO K76) 1100750 61
optional 62 amp (RPO K81) 1117765 62

1967 - 283/327/396
ACCESSORIES NUMBER AMPS
standard (stamped "CB") 1110693 37
optional 42 amp (std w/TH400 (stamped "CS") (RPO K79) 1100696 42
A/C only (RPO K76) 1100750 61
optional 62 amp (RPO K81) 1117777 62

1968 - All
ACCESSORIES NUMBER AMPS
No pulley 1100696 42
6-cyl w/o smog control or P.S.; 8-cyl exc. Turbo-Hydramatic 1100794 37
V-8 w/Turbo-Hydramatic A/C 1100795 61
6-cyl w/o smog control or P.S.; 8-cyl A/C 1100796 61
6-cyl smog control or P.S. 1100813 67
6-cyl P.S. 1100815 42
6-cyl smog control or P.S. A/C 1100817 61
Optional 1117777 62

1969 - All
ACCESSORIES NUMBER AMPS
standard 1100834 37
6-cyl smog control or P.S. 1100836 37
optional 396-375 1100837 37
extra output RPO (K79) 1100842 42
V-8 A/C 1100843 61
6-cyl A/C 1100845 61
extra output (RPO K85) 1100849 61

1970 - 307/350/402/454
ACCESSORIES NUMBER AMPS
standard with 307/350/402 (L34)/454 (LS3/LS5) 1100834 37
standard with 402/454 L78/LS6 (deep pulley) 1100837 37
A/C only 1100843 61
optional 63 amp (RPO K85) 1100847 63

1971 - 307/350/402/454
ACCESSORIES NUMBER AMPS
standard 1100566 37
LS6 454-425 (engine n/a in the Chevelle) 1100837 37
A/C only 1100843 61
optional 63 amp 1100917 63

1972 - 307/350/402/454
ACCESSORIES NUMBER AMPS
standard except 402/454 1102440 37
standard with 402/454 1102454 37
A/C only 1102463 61
optional 63 amp 1102464 63
 
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