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65-74 MoPar Block Casting Numbers

On the slant six engines these numbers can be found on the passenger side of the block just below the head. 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 (March 15th), or based on the 10,000 day calendar (2787 = March 15 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  4=1974
Example: B-273-A24 reads as a 1966 block with a displacement of 273 and built on October 24th

I6 Block Casting Numbers
Slant Six
Casting No CID Year Family
2202843 170 60-64 G
2205630 170   G
2264478 170   G
2463230 170 65 G
2463395 170   G
******* 198   G
2202857 225   RG
2205528 225   RG
2463430 225 66 RG
2806830 225 68-70 RG
3462605 225 75 RG
2951694 225   RG
V8 Block Casting Numbers
V Eights
Casting No CID Year Family
2463252 273   LA
2465330 273 64-66 LA
2536130 273 65-69 LA
2806130 273 66-69 LA
2264230 318 60-66 A
2468230 318   A
2532630 318   A
2466090 318 67-74 LA
2536030-318 318 67-75 LA
2566080 318   LA
2806030 318 67-74 LA
4104230 318   LA
2780930-340 340 68-73 LA
3577130TA-340 340 70-71 LA (TA/AAR)
1944929 350 58  
3418496-360 360 71-74 LA
3870230 360 75-UP LA
3418496-360 360 71-74 LA
4179930 360   LA