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Early (60-74) MoPar Casting Numbers

For V8 engines these numbers can be found on the drivers side front of the block just below the head.

The engine casting number for the most part includes the build year and the engine displacement. It may also have an assembly date. The twist to decoding the assembly date may be as simple as 3.15.69 or 3-15-69 (March 15th 1969).

The letter before the number indicates the year
A=1965  B=1966 C=1967 D=1968 E=1969 F=1970 G=1971 H=1972  J=1973  K or 4=1974 L or 5=1975 M or 6-1976 N or 7=1977
Example: EH426 reads as a 1969 Hemi block with a displacement of 426

B Family Family Big Block Casting Numbers
Casting No CID Year Family
1737629 361 61-64 B
2120329 361 58-66 B
2120229 361   B (Industrial)
2120429 361   B
2128854 361/383 64 B
2205712 361 58-66 B
1945429 361 65 B
2658930 361 65 B
2468130 383 59-71 B
2532130 383 65 B
2899830 383 70 B
3614230 400 71-72 B
3698630 400 73-78 B
4006530 400 76-78 B
4006530-400-12 400 76-78 B
RB Big Block Block Casting Numbers
Casting No CID Year Family
1851629 413 61 RB
1852029 413 62-63 RB (Max Wedge)
2120529 413 59-65 RB
2205697 413/426 59-65 RB (Pass Car)
2468030 413   RB
1852029 426 62-65 RB (Wedge)
2406730 426 63-65 RB (Wedge)
2532230 426 64-66 RB (Wedge)
2468330 426 64-65 RB
2468330 426 66-71 RB (Hemi)
2658836 426   RB (Industrial)
2536430 440 66-72 RB
3698830-440 440 73-78 RB
4006630 440 75-78 RB