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Engine numbers, for engines up to 1974.

To find the engine number for slant six engines, check the passenger side of the block just below the head. For V8 engines, check the drivers side front of the block below the head.

The engine number contains the build year and engine displacement. It may contain an assembly date. 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 simple date is decoded like the so number on fender tags.

The letter before the number is the model 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...1966-273cid- October 24th


You can also tell the block displacement by the casting number. Often, but not always, a casting date may appear on the side of the block.

Casting # CID Year Family
2202843 170   G
2205630 170   G
2264478 170   G
2463230 170 1965 G
******* 198   G
2202857 225   RG
2205528 225   RG
2463430 225   RG
2806830 225   RG
2465330 273 1964-66 LA
2536130 273 1965 LA
2466090 318   LA
2536030-318 318 1967-1975 LA
2566080 318   LA
2806030 318 1967-1974 LA
2780930-340 340 1968-1973 LA
3577130TA-340 340 1970-1971 LA(TRANS-AM)
3418496-360 360 1971-1974 LA
3870230 360 1975 & UP LA