How to Decode your Dodge WDX-WM300 Engine Number
 

1946-1968 Dodge WDX-WM300 Power-Wagons all came from the factory with Flat Head Six engines.

1946-1960 Dodge WDX-WM300 Power-Wagons used the 230ci FH6, and 1961-1968 WM300s used the 251ci FH6.

Both of these engines have the ID number stamped in the same basic location, on a raised pad, on the driverís side of the engine, about 3" back from the front of the block, just below the head. The Power-Wagon engine number tends to be stamped into the face of the pad on the side facing the inner fender. A replacement engine may have the engine number stamped on the side, or on the top of the pad depending on the engine and what it came from. Check the Flathead Six Engines Page for more information.
The pictures below are from a 230 engine in a 1951 or 1952 Dodge B-3-PW6-126 Power-Wagon:


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The pad on a 251 is a little different in shape, but is still in the same basic location as the engine number on a 230.
The pictures below are from a 251 engine in a 1962 WM300 Power-Wagon:

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Breakdown of the Engine Numbers by Year
Year Displacement Length of head Parts Books Show Actual Engines
1946-1957 230ci 23 inches T137- T137-
1958 230ci 23 inches L6WM3 L6D3 or L23 or L230
1959 230ci 23 inches M6-W3M M23 or M230
1960 230ci 23 inches TP-23-8-3 TP23-23-8-3
Year Displacement Length of head Parts Books Show Actual Engines
1961 251ci 25 inches TR-25-8-3 R25
1962 251ci 25 inches TS-25-8-3 S25
1963 251ci 25 inches TT-25-8-3 T25
1964 251ci 25 inches VT-25-8-3 V25
1965 251ci 25 inches AT-25-8-3 A25
1966 251ci 25 inches BT-25-8-3 B25 or B251
1967 251ci 25 inches CT-25-8-3 C25
1968 251ci 25 inches DW25121880000 ????
 
Detailed Breakdown
T137- This is the Engineering code for 1946-1957 WDX to K6-W300 Power-Wagons. The engines in that era were labeled based on the trucks engineering code, so Power-Wagon engine numbers were prefixed with T137.
L6WM3
L 1958
6 6 Cyl
WM3 WM300
This is what the parts books show the W300M engine in the Power-Wagon was labeled in 1958, but Dodge did not seem to use this system of labeling.
L6D3
L 1958
6 6 Cyl
D3 D300
The parts books books show the number L6 D3 to be only for 230ci engines in 1 ton 2wd 1958 Dodge trucks, but this label is found on the engine in many models of light duty 2wd and 4wd Dodge trucks. Actual trucks show that for the most part Dodge stamped all of the engines of the same size with the same code, instead of labeling them differently for each model as was done in previous years.
L23 or L230
L 1958
23 230ci
230 230ci
Starting at some point in 1958 Dodge started labeling the 230s L23 or L230, L is for 1958 and 23 or 230 is for 230ci engine.
M6-W3M
M 1959
6 6 Cyl
W3M W300M
This is what the parts books show the W300M Power-Wagons engine number should be in 1959, but Dodge did not seem to use this system of labeling.
M23 or M230
M 1959
23 230ci
230 230ci
Dodge seems to have labeled all 230ci FH6s used in Dodge trucks in 1959 either M23 or M230.
TP-23-8-3
T Truck
P 1960
23 230ci
8 Month
3 Day

Starting in 1960 Dodge decided to add some more info to the engine number, the month and day the engine was made.

These engines are supposed to have a sequential build number after the date, but this has not yet been shown on real trucks.

TR-25-8-3
T Truck
R 1961
25 251ci
8 Month
3 Day
This is the number the parts books claim was used in 1961, it is not been found on real trucks yet.
R25
R 1961
25 251ci
This is the number that has been found so far on 1961 WM300s.
TS-25-8-3
T Truck
S 1962
25 251ci
8 Month
3 Day
This is the number the parts books claim was used in 1962, it is not been found on real trucks yet.
S25
S 1962
25 251ci
This is the number that has been found so far on 1962 WM300s.
TT-25-8-3
T 1963
T Truck
25 251ci
8 Month
3 Day
For some reason the parts books swap from T being the first digit like in 1961-62 to being the second digit in 63-67. This number has yet to be found on a real truck
T25
T 1963
25 251ci
This is a guess as to what the engine number is in 1963, there is not enough data yet to prove it, and it might be T251.
VT-25-8-3
V 1964
T Truck
25 251ci
8 Month
3 Day
This is the number the parts books claim was used in 1964, it is not been found on real trucks yet.
V25
V 1964
25 251ci
This is a guess as to what the engine number is in 1964, there is not enough data yet to prove it, and it might be V251.
AT-25-8-3
A 1965
T Truck
25 251ci
8 Month
3 Day
This is the number the parts books claim was used in 1965, it is not been found on real trucks yet.
A25
A 1965
25 251ci
This is a guess as to what the engine number is in 1965, there is not enough data yet to prove it, and it might be A251.
BT-25-8-3
B 1966
T Truck
25 251ci
8 Month
3 Day
This is the number the parts books claim was used in 1966, it is not been found on real trucks yet.
B25
B 1966
25 251ci
This is a guess as to what the engine number is in 1966, there is not enough data yet to prove it, and it might be B251.
CT-25-8-3
C 1967
T Truck
25 251ci
8 Month
3 Day
This is the number the parts books claim was used in 1967, it is not been found on real trucks yet.
C25
C 1967
25 251ci
This is a guess as to what the engine number is in 1967, there is not enough data yet to prove it, and it might be C251.
DW25121880000
DW Plant made at, in this case Windsor
251 Displacement, 251ci
2188 Date code, 25th of July 1967
0000 Engine built that day
This is the number the parts books claim was used in 1968, it is not been found on real trucks yet.
???? There is not yet any data about what Dodge did for real with the engine numbers when they changed numbering systems .
 
The T137 engine numbers are sequential from 1946 until 1957. The starting number is T137-1001 and should end around or after T137-108001.
Here are a few engine numbers from actual trucks to give an idea of what number would have been used in what year. This is only done for T137 motors, as the rest break down the year as part of the engine code.
T137  
Detroit Production Year
T137-1367 1946-1947
T137-1586 1946-1947
T137-1688 1946-1947
   
T137-8521 1948
T137-8793 1948
T137-9494 1948
T137-9741 1948
T137-9759 1948
T137-10514 1948
T137-11318 1948
T137-11492 1948
T137-12047 1948
   
T137-15153 1949
T137-14978 1949
T137-16255 1949
   
T137-28137 1952-1953
T137-28478 1952-1953
   
T137-30351 1953
T137-32007 1953
   
T137-36131 1954
   
T137-87242 1955-1956
   
T137-104869 1957
T137-105195 1957
T137-105466 1957
T137-107394 1957
   
California Production Year
T137-7265 1946-1947
T137-20403 1950
T137-20437 1950
T137-21641 1951
T137-27452 1952-1953
T137-29314 1952-1953
 
For further reference:

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I hope to update this page from time to time as more information becomes available. I am also very interested in suggestions for additional content to include on this page.

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