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    AMC 258 CID 6 Cylinder - Late 1973 - 1986

The six digit Engine Code is stamped on the pad at the right upper center of the block.

1st Digit/Year

6- 1973
7- 1974
8- 1975
9- 1976
1- 1977
2- 1978
3- 1979
4- 1980

2nd & 3rd Digit

Month

4th Digit/Type

A- 6-258 1V Carb, 8.0:1 Compression Ratio
C- 6-258 2V Carb, 8.0:1 CR
M- 6-258 2V Carb, 8.0:1 CR (VAM/Built in Mexico)

5th & 6th Digit

Day of Month