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  What date code should be on my part? ©

By Moparr Motor - Detroit (January 5, 1996, Updated December 7, 2004)

We have had this question asked of us for many years and we feel that the following table will help clarify this issue of that is the correct date code that should be on a component. The following table should be used as a "general guide" as to how many days prior to the production date of your vehicle should a component be to be considered correct for that vehicle.

Engine casting vs. build dates:

The standard is typically around 30-90 days. The more common the engine (i.e., 318 or 383) the closer the casting date will be to the final assembly date of the engine However, 440 +6 are as high as 90-120 days and Hemi’s have been as high as 1 year.

It has been discovered that different production years had the build date of the engine closer to the scheduled production date of the vehicle. The closest dates observed was early 1968 production followed by 1970 and then 1971.

Vehicle schedule build date vs. actual build date

These dates do not always match up. There could be a variation of as much as 30 days. There are various causes for variation due to lack of material and/or efforts to batch like models, powertrain configurations and/or colors.

Note:

  1. These date apply primarily to vehicles produced from 1966 - 1973.
  2. This table is a work in progress and will be updated as more information is obtained.
  3. Keep in mind that we this subject deals with mass production and there is always variation (controlled and uncontrolled) that took place and there is not absolutes.

Item #

Component

Total days prior to build of Vehicle

Comment

1

Castings (Days prior to build of engine)

   

1.1

Intake manifold

   

1.1.1

426 Hemi

90

 

1.1.2

440 + 6 bbl - Alum and iron

60 - 90

 

1.1.3

440 4 bbl

60

 

1.1.4

383

60

 

1.1.5

340 4 bbl

60

 

1.1.6

340 + 6

   

1.1.7

318

60

 

1.2

Cylinder blocks

   

1.2.1

426 Hemi

90-200

 

1.2.2

440 HP

90

 

1.2.3

440 HP2

60-120

 

1.2.4

383 std & HP

90

 

1.2.5

340 + 6

90-120

 

1.2.6

340 std

90

 

1.2.7

318

90

 

Item #

Component

Total days prior to build of Vehicle

Comment

13.

Cylinder heads

   

1.2.1

426 Hemi

90

 

1.2.2

440 HP

90

 

1.2.3

440 HP2

60

 

1.2.4

383 std & HP

60

 

1.2.5

340 + 6

90

 

1.2.6

340 std

60

 

1.2.7

318

60

 

1.4

Exhaust manifolds

   

1.2.1

426 Hemi

30-90

 

1.2.2

440 HP

30

 

1.2.3

440 HP2

30

 

1.2.4

383 std & HP

30

 

1.2.5

340 + 6

30

 

1.2.6

340 std

30

 

1.2.7

318

30

 

1.5

Thermostat housings

90- 120

 

1.6

Alternator

120

 

1.7

Starter

120

 

1.8

Water pump housing

90

 

1.9

Auto transmission main case

120

 

1.10

Auto transmission tail shaft

120

 
       

2

Engine final assembly

   

2.2.1

426 Hemi

60 - 90

 

2.2.2

440 HP

25 - 45

 

2.2.2

440 HP2

45 - 90

 

2.2.3

383

15 -30

 

2.2.4

340

30

 

2.2.5

318

30

 
       

3

Engine Accessories and misc. components

   

3.1

Power steering pump pulley

60

 

3.2

Temperature sending unit

30

 

3.3

Engine mount rubber isolators

120

 

3.4

Drive belts

30 -45

 

3.5

Power steering cooler

60-90

 

3.6

Throttle cable

120

 
 

Oil pressure sending unit

30

 
       

4

Transmission final assembly

   

4.1

Automatic transmission

   

4.1.1

426 Hemi

60 - 200

 

4.1.2

440 HP & HP2

45 - 60

 

4.1.3

383 HP

30

 

4.1.4

440 Standard duty

30

 

4.1.5

318,340, 383 standard duty

30

 

4.2

Manual transmission - 23 spline

30

 

4.3

Manual transmission - 18 spline

30

 

Item #

Component

Total days prior to build of Vehicle

Comment

5

Axle / drive shaft related

   

5.1

Dana

   

5.1.1

Dana build

120 -200

 

5.1.2

Dana tube assembly

120 -200

 

5.2

Drive shaft

120

 

5.3

U joint straps

120

 
       

6

Fuel related

   

6.1

Carburetor

   

6.1.1

2 bbls - Carter & Holley

30

 

6.1.2

4 bbl - Carter & Holley

30

 

6.2

Fuel pump

120

 

6.3

Fuel sending unit

60

 
       

7

Hoses

   

7.1

Radiator hose

   

7.2

Heater hose

90

 

7.3

Power steering pressure hose

120

 

7.4

Power steering return hose

120

 

7.5

Crank case breather hose

120

 

7.6

PCV hose

120

 

7.7

Brake vacuum hose

120

 
       

8

Glass

   

8.1

Front & Back

30

 

8.2

Side

30

 

8.3

Outside mirror

30

 
       

9

General body related

   

9.1

K member

120

 

9.2

Radio related

   

9.2.1

Radio

120

 

9.2.2

Radio speaker

120

 

9.3

Jack

120

 

9.4

Windshield wiper related

   

9.4.1

Wiper motor

120

 

9.4.2

Wiper switch

120

 

9.4.3

Washer bottle

120

 

9.4.4

Washer bottle motor

120

 

9.5

Battery

30

 

9.6

Seat belts

30 - 60

 

9.7

Hood latch

120

 

9.8

Hood safety

120

 

9.9

Horns

120

9.10

Carpet

30-60

 

9.11

Head liner

30-60

 

9.12

Trunk mat

30-60

 

9.13

Console

30-60

 

9.14

Head lights

30

 
       

Item #

Component

Total days prior to build of Vehicle

Comment

10

Coolant / heater and A/C related

   

10.1

Heater box

30

 

10.2

Radiator

120

 

10.3

Fan - clutch

120

 

10.4

A/C dryer

60

 

10.5

A/C compressor

60

 

10.6

A/C condenser

60

 

10.7

Blower motor

30

 
       

10

Ignition / charging system related

   

10.1

Voltage regulator

60

 

10.2

Distributor

30

 

10.3

Ignition coil

120

 

10.4

Spark plug wires

30 - 60

 

10.5

Alternator - final assembly

120

 

10.6

Electronic ignition module

30

 

10.7

Starter relay

30

 
       

11

Suspension related

   

11.1

Lower control arms

45 - 60

 

11.2

Torsion bars

45 - 60

 

11.3

Upper control arms

45 – 60

 

11.4

Shocks

120

 
       

12

Brakes related

   

12.1

Power brake booster

30

 

12.2

Master cylinder

30

 

12.2

Metering / proportioning valves

30

 

12.3

Emergency brake mechanism

30

 
       

13

Wheel / tire related

   

13

Wheels

   

13.1.1

Wheels std

21 -30

 

13.1.2

Wheels ralley / magnum style

21-30

 

13.2

Tires

30

 

13.3

Inflatable spare relater

   

13.3.1

Tire

120

 

13.3.2

Wheel

120

 

13.3.3

Inflation bottle

90- 120

 

13.4

Wheel covers

120

 

13.5

Hub caps

120

 
       

14

Seat related

   

14.1

Seat tracks

   

14.1.1

Seat track buckets / bench

120

 

14.1.2

Seat track - 6 way adjustable

60 -90

 

14.2

Seat coverings

120

 

 
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