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Plymouth

Engine Build Date Codes

 

1960 Block Stamp: PR38620

PR
Year, Block
38
Cubic inch
6
Month
20
Day
 

1960-67 Block stamp: R411006

R
Year
41
Cubic inch
10
Month
06
Day
 
Build Date
Code
Year
Code
year
P 1960 V 1964
R 1961 A 1965
S 1962 B 1966
T 1963 C 1967
 
Code
Month
Code
Month
1 January 7 July
2 February 8 August
3 March 9 September
4 April 10 October
5 May 11 November
6 June 12 December
 
1968-72 Block Stamp: FW44029001234
FW
Plant
440
Cubic inch
2900
Build date code
1234
Engine number
 
1973 Block Stamp:
"A" Engine Family: JM440P40005678
JM
Series, Plant
440P
Cubic inch, Model
4000
Build date code
5678
Engine number
"B and G" Engine Family: J440P9-152
J
Series
440P
Cubic inch, Model
9-15
Build date
2
Build Shift
 
1974-75 Block Stamp:
"A" Engine Family: 4M440P45005678
4M
Year, Plant
440P
Cubic inch, Model
4500
Build date code
5678
Engine number
"B and G" Engine Family: 4W440P9-152
4W
Year, Plant
440P
Cubic inch, Model
9-15
Build date
2
Build Shift
 

Series, Plant codes:

J= 1973 K= 1974 L= 1975

NM- Marysville

M- Mound road plant

T-Trenton plant

W- Windsor plant

Build date code:

1970: start at 2895 thru 3259

1971: start at 3260 thru 3624

Build date code:

1972: start at 3625 thru 3990

1973: start at 3991 thru 4355

Model codes:

HP- High Performance

LC- Low compression

P- Premium fuel

R- Regular fuel

S- Special engine

 

 

The engine build date code decoder reveals the plant, year, engine displacement, and month and day of manufacture.

Plymouth Engine Codes