Flathead Engine Numbers: 1958-1968
 
 
Chrysler used the letters D, P, C, S, and T to start the engine numbers up until 1957. Starting in 1958, for the Dodge Trucks at least, the engine numbers followed a different pattern. The first list below is what the parts books claim the numbering system should be. The second list is the numbers that have been found on actual trucks.
 
The list below is all the Engineering codes for each model of Dodge Truck that could be found at the time this list was made. The Engineering code is normally the code that is used as the beginning of the engine number on these vehicles. Most of these codes will be followed by a sequential number that would help calculate when the engine was made if a list of starting numbers was available. These codes are in order by first letter, and then numeric order, not by year, or type of vehicle.
 
Engineering code Displacement Length of head Make Model Year
L6D1 230ci 23 Inches Dodge Truck D100 1958
L6D2 230ci 23 Inches Dodge Truck D200 1958
L6D3 230ci 23 Inches Dodge Truck D300 1958
L6D4 251ci 25 Inches Dodge Truck D400 1958
L6D5 251ci 25 Inches Dodge Truck D500 1958
L6D6 265ci 25 Inches Dodge Truck D600 1958
L6W1 230ci 23 Inches Dodge Truck W100 1958
L6W2 230ci 23 Inches Dodge Truck W200 1958
L6W3 251ci 25 Inches Dodge Truck W300 1958
L6WM3 230ci 23 Inches Dodge Truck W300M 1958
L6W5 265ci 25 Inches Dodge Truck W500 1958
L6S4 251ci 25 Inches Dodge Truck S400 1958
L6S5 251ci 25 Inches Dodge Truck S500 1958
L6S6 265ci 25 Inches Dodge Truck S600 1958
L6P3 230ci 23 Inches Dodge Truck P300 1958
L6P4 230ci 23 Inches Dodge Truck P400 1958
M6D1 230ci 23 Inches Dodge Truck D100 1959
M6D2 230ci 23 Inches Dodge Truck D200 1959
M6D3 230ci 23 Inches Dodge Truck D300 1959
M6D4 251ci 25 Inches Dodge Truck D400 1959
M6D5 251ci 25 Inches Dodge Truck D500 1959
M6D6 265ci 25 Inches Dodge Truck D600 1959
M6W1 230ci 23 Inches Dodge Truck W100 1959
M6W2 230ci 23 Inches Dodge Truck W200 1959
M6W3 251ci 25 Inches Dodge Truck W300 1958
M6WM3 230ci 23 Inches Dodge Truck W300M 1958
M6W5 265ci 25 Inches Dodge Truck W500 1959
M6S4 251ci 25 Inches Dodge Truck S400 1959
M6S5 251ci 25 Inches Dodge Truck S500 1959
M6S6 265ci 25 Inches Dodge Truck S600 1959
M6P3 230ci 23 Inches Dodge Truck P300 1959
M6P4 230ci 23 Inches Dodge Truck P400 1959
TP23 230ci 23 Inches Dodge Truck D100, D200, D300, W100, W200, P300, P400, WM300 1960
TP25 251ci 25 Inches Dodge Truck W300, D400, D500, S400, S500 1960
TP26 265ci 25 Inches Dodge Truck W500, D600, S600 1960
TR25 251ci 25 Inches Dodge Truck W300, WM300, D400, P400, S400, D500, S500, W500 1961
TR26 265ci 25 Inches Dodge Truck   1961
TS25 251ci 25 Inches Dodge Truck W300, WM300, D400, P400, S400, D500, S500, W500 1962
TS26 265ci 25 Inches Dodge Truck   1962
TT-25-8-3 251ci 25 inches Dodge Truck WM300 1963
VT-25-8-3 251ci 25 inches Dodge Truck WM300 1964
AT-25-8-3 251ci 25 inches Dodge Truck WM300 1965
BT-25-8-3 251ci 25 inches Dodge Truck WM300 1966
CT-25-8-3 251ci 25 inches Dodge Truck WM300 1967
DW25121880000 251ci 25 inches Dodge Truck WM300 1968
 
The Engine numbers below have been checked with actual trucks, and are more likely to reflect what Dodge did then the lists from the parts books above
 
Engineering code Displacement Length of head Make Model Year
L23 or L230 230ci 23 Inches Dodge Truck D100, D200, D300, W100, W200, P300, P400, W300M 1958
L25 or L251 251ci 25 Inches Dodge Truck W300, D400, D500, S400, S500 1958
L26 or L265 265ci 25 Inches Dodge Truck W500, D600, S600 1958
M23 or M230 230ci 23 Inches Dodge Truck D100, D200, D300, W100, W200, P300, P400, W300M 1959
M25 or M251 251ci 25 Inches Dodge Truck W300, D400, D500, S400, S500 1959
M26 or M265 265ci 25 Inches Dodge Truck W500, D600, S600 1959
TP23 230ci 23 Inches Dodge Truck D100, D200, D300, W100, W200, P300, P400, WM300 1960
TP25 251ci 25 Inches Dodge Truck W300, D400, D500, S400, S500 1960
TP26 265ci 25 Inches Dodge Truck W500, D600, S600 1960
R25 251ci 25 Inches Dodge Truck W300, WM300, D400, P400, S400, D500, S500, W500 1961
R26 265ci 25 Inches Dodge Truck   1961
S25 251ci 25 Inches Dodge Truck W300, WM300, D400, P400, S400, D500, S500, W500 1962
S26 265ci 25 Inches Dodge Truck   1962
T25 251ci 25 inches Dodge Truck WM300 1963
V25 251ci 25 inches Dodge Truck WM300 1964
A25 251ci 25 inches Dodge Truck WM300 1965
B25 or B251 251ci 25 inches Dodge Truck WM300 1966
C25 251ci 25 inches Dodge Truck WM300 1967

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