Mopar Engine, Trans & Date codes, Julian Perpetual Calendar plus Dodge & Plymouth Casting and Stamping numbers.
Mopar Julian Perpetual Day Calendar
K-Frame, Wiper Motor, Carburetor, Hood Latch, Radio, Heater, Speedo, Rear End, Intake, and many more sample photos
Non Leap Years (1970, 71, 73 & 74)
Leap Year (1972)
10,000 Day Calendar & Engine Codes
Dodge & Plymouth Engine / Transmission serial numbers and symbols decoder
1969 Model Year (2530 – 2894)
1970 Model Year (2895 – 3259)
1971 Model Year (3260 – 3624)
1972 Model Year (3625 – 3990)
1973 Model Year (3991 – 4355)
1974 Model Year (4356 – 4720)
Engine Assembly Plant Codes:
M or PM= Mound Road, Detroit, Michigan Plant (318-340-360)
W = Windsor, Ontario Plant (318-340-360)
T or PT = Trenton, Michigan Plant (198-225-383-400-440)
MN, NM or MV = Marysville, Michigan Plant (426 Hemi)
Transmission Assembly Plant Codes:
PK = Kokomo Plant, Indiana (Automatic Transmissions)
PP = New Process Gear Division, Syracuse NY (Manual Transmissions)
Decoding Additional Symbols & Stampings:
A = .020″ Oversized Cylinder Bore
B = .010″ Undersized Main & Rod Bearings (Oversized Bearings)
C = Special Crankshaft & Pistons
E = Cast Crankshaft
H = Standard 4 Barrel Carb
HP = High Performance
LC = Low Compression
OS = .005″ Oversized Valve Stems
P = Premium Fuel Recommended
S = Service Engine (found on Warranty Blocks)
sP = Special Engine use Premium Fuel (found on T/A 340 Engines)
WT or TW = Water Tested (normally found on Hemi’s & Warranty Blocks)
X = Oversized Valve Guides
2 = Second Shift
♦ = .008″ Oversized Tappets
✠ = .001″ Undersized Crankshaft Journals (Oversized Bearings)
✠+X = .010″ Undersized Crankshaft Journals
Common E-Body Date Codes (Coming Soon)
Single Letter on Engine Identification Pad (F=1970, G=1971, H=1972, J=1973, 4=1974)
Letter & Number Dates… lots of detailed info and photos being uploaded soon!