Year Identification Stampings
For 1960-1964 blocks the engine code will start with a letter year code in the set [ P R S T V ] that indicates [ 1960 .. 1964 ] (in set order). The Year code is followed by the first two digits of the CID displacement (ex. 36, 38, 41, 42 would indicate 361, 383, 413, 426). If an additional three digits follow, usually after a dash, these will indicate the date it was stamped (not necessarily cast).
For Engines made begining in 1965, again the first character indicates the year [ A B C D E F G H J ] for [ 1965 .. 1973 ] (in set order). The full CID displacment will follow. If a dash and three numbers follow, this indicates the date it was stamped (not necessarily cast). Some of these engines will be stamped with an HP indicating that it was destined for a high performance application. Likewise, a L or LC would indicate a low compression engine. This isn't an either/or relationship. A block might not have either an HP or an LC. And not all block that wound up in high performance applications always got a block stamped HP.
For Engines made begining in 1974, the CID displacement will be prepended a "[ 4 .. 8 ]T-" Where 4T- means 1974, and 8T- mean 1978. The "T" indicates that it was made at the Trenton Plant (it does not mean truck). Quite often, these stamped IDs will be followed with an E indicating a cast crank.
Oversize/Undersize Stampings
There are many other stmapings that wound up on the ID pad or along the oil pan rail. These were mostly to indicate to the engine assemblers that oversize or undersize components will need to be used because a journal or bearing was machined to require it. Here is a short list: Symbol Descriptions
M .001 undersize main bearing journals
A .020 oversize cylinder bores
E cast cranks
Diamond oversize tappets
O.S. .005 oversize valve stems
P premium fuel
R regular fuel
Maltese Cross .001" undersized bearing shells
Maltese Cross and X .010" undersized crankshaft
RX or MX all main or rod journals .010" undersized
S special engine
WT or TW water test
X oversized valve guides
Casting Numbers and Markings
Below is a listing of casting numbers for A-series, B/RB-series, LA-series, and G/RG-series engines
For additional engine ID information for B/RB engines,see this page.
Mopar Engine Block Casting Numbers casting number CID years notes
1737629 361 1961-1964
1851729 383 1959-1964
1852029 413 1959-1962 Truck
1852029 413 1962 Max Wedge
1944929 350 1958
2120329 383 1959-1964
2120529 413 1959-1965
2202843 170 1960-1964 (G-series)
2202857 225 (RG-series)
2205528 225 (RG-series)
2205630 170 (G-series)
2205697 413 1959-1965
2205697 426 1964
2205712 361 1958-1966
2264230 318 1960-1966 (A-series)
2264478 170 (G-series)
2406730 426 1963-1965
2432230 426 1964-1965
2463230 170 1965 (G-series)
2463395 170 1965 (G-series)
2463430 225 1960-1967 (RG-series)
2465330 273 1964-1966 (LA-series)
2468030 413
2468130 383 1959-1971
2468330 426 1964-1971 Hemi
2532230 426 1964-1666
2536030 318 1967-1975 (LA-series)
2536130 273 1965 (LA-series)
2536430 440 1966-1972
2536430 440 1966-1972
2568130 383 1959-1971
2658836 426 1966-later Industrial
2780930 340 1968-73 (LA-series)
2806130 273 1966-69 (LA-series)
2806830 225 1968-1970 also 198(RG-series)
2951694 225 (RG-series)
3418496 360 1971-74 (LA-series)
3462605 225 1975 (RG-series)
3577130 340 1970 T/A(LA-series)
3614230 400 1971 (thicker main webbing)
3698330 440 1973-1978
3698630 400 1973-1978
3698830 440 1973-1978
3870230 360 1975 (LA-series)
4006530 400 1976-1978
4006530 440 1974-1978 (??)
4006630 440 1975-1978
4006730 318 1976-1979 (LA-series)
4006830 360 1976-1980 (LA-series)
4027163 318 1980-1985 (LA-series)
4027593 318 1980-1985 (LA-series)
4027596 360 1980-1985 (LA-series)
4041314 225 1976-1977 forged crank(RG-series)
4071051 360 1980-1985 (LA-series)
4071072 225 1976-1977 cast crank(RG-series)
4104230 318 1980-1983 (LA-series)
4323302 318 1986-1990 (LA-series)
4323345 360 1986-1989 (LA-series)
4343475 360 1986-1988 (LA-series)
4343923 360 1986-1988 (LA-series)
4448308 360 1989-1991 (LA-series)
This information is provided "as is" and is for information purposes only!!!
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