How to accurately identify a Ford engine

Looking to check your Ford engine information but don't know where to start? Don't worry! Ford began tagging engines with identification tags in the mid-1950s and fully implemented this on all engines by January 1964. These tags provide crucial information such as: month and year of manufacture, model year, modification class code, and cylinder displacement (CID).

If you can't find the identification tag, you can still look up engine information using the casting number on the engine block. This article will guide you through the simplest way to accurately identify a Ford engine – even if you're not a mechanic or technical expert.

Part 1: The most accurate way to identify a Ford engine using its aluminum ID tag.

Step 1: How to identify the type of Ford engine by the number of bolts on the valve cover.

If you're standing in front of a Ford engine and want to know what type it is, look at the number of bolts on the valve cover. These are the large bolts located at the top of the engine, holding the metal plate (usually with the word "Ford" on it) above the valve system.

Here's how engines are classified based on the number of bolts:

2 bolts:
→ One of the following types: 239 / 256 / 272 / 292 / 312

5 bolts:
→ One of the following types: 332 / 352 / 360 / 361 / 390 / 391 / 406 / 410 / 427 / 428

6 bolts:
→ One of the following types: 221 / 260 / 289 / 302 / 351 Windsor (351W)

7 bolts:
→ One of the types: 429 / 460

8 bolts:
→ One of the following types: 351 Cleveland (351C) / 351 Modified (351M) / 400

Note: Correctly identifying the engine type will help you find more detailed information, such as the engine identification code (ID tag). This is a crucial step for repairing or replacing parts accurately.

Step 2: How to find the engine ID tag on a Ford vehicle (especially 6-cylinder and some V8 engines)

To accurately identify the year of manufacture, make, and engine type, you need to find the ID tag – an aluminum strip engraved with an identification code. Here's how to find and locate this tag:

Location of ID card

• The ID tag is located beneath the bolts that hold the ignition coil in place.

• Specific location: Near the front of the vehicle, to the left or right of the engine .

• Applies to:

  • All 6-cylinder engines manufactured after 1964

  • Some V8 engines

Features of the card

• Material: Aluminum

• Dimensions: Approximately 7.5 cm (3 inches) long and 1.2 cm (0.5 inches) wide.

• Content: A series of letters and numbers engraved on the surface – this is the identification code that helps to look up information about the engine.

Tip:

If you're unsure what type of engine you have, check the bolt numbers on the valve cover (valve cap) as instructed in the previous section. This will help narrow down your search and make identification easier.

Remember: The ID tag is key to accurately identifying the origin and specifications of the engine – crucial when getting repairs or purchasing parts.

Step 3: How to find the engine ID tag on a V8, model 352 machine.

If you are inspecting a V8 engine, specifically the 352 series , pay attention to the following particular location:

Inspection location

• Under the bolts holding the dipstick

• The dipstick is a small rod with a plastic handle , used to check the engine oil level.

How to do it

1. Locate the oil dipstick on the engine.

2. Locate the bolts that secure the rods to the engine block.

3. Check underneath those bolts – you might find the ID tag or other identifying marks of the 352 engine.

Note

• This position applies only to the 352 V8 engine .

• If you're unsure of the engine type, count the number of bolts on the valve cover to determine it (352 engines usually have 5 bolts ).

In short: With the V8, 352 model, the ID tag or identification information may be located right under the dipstick retaining bolt – don't overlook this location during inspection!

Step 4: Final locations to check if the engine ID tag is not yet found.

If you've checked common locations and still haven't found the ID tag, try looking in the less noticeable places below. These are the last places where the tag might have been attached:

Location requiring further inspection.

1. Below the heat indicator bulb
   → Applicable to engines: 360, 330, 391

2. Below the dipstick tube bolt
   → Applicable to engine: 352

3. Below the carburetor stud
   → Applicable to engines: 401, 477, 534

4. Below the ignition coil retaining bolt (ignition coil bolt)
   → Applicable to many other machine models

What if you still can't find it?

• The ID card may have:

  • Removed

  • Lost

  • It can only be seen when the engine is removed from the car.

Tips for identifying the tag by its position:

Card position	Suggested engine types
Below the temperature indicator light	360, 330, 391
Under the oil dipstick bolt	352
Under the carburetor screw	401, 477, 534

If you're tracing the engine ID tag, don't overlook small details like bolts, indicator balls, or carburetor mounts. These locations can provide crucial information for correctly identifying the engine type.

Step 5: How to read a Ford engine ID card accurately and easily.

After locating the ID tag on the engine, the next important step is deciphering the information engraved on it . Fortunately, reading the tag is quite simple if you understand its structure. The information structure on the ID tag (read from top left to bottom right)

1. Cylinder Displacement (CID)

• Location: The first 3 digits, in the upper left corner

• Meaning: Engine displacement in cubic inches.

• Example: 390 = 390 CID engine

2. Manufacturing plant

• Location: The letter immediately to the right of the CID code

• Meaning: This symbol indicates the place where the engine was manufactured.

  Symbol	Factory
  C	Cleveland, USA
  E	Ensite, Canada
  W	Windsor, Canada

3. Year of manufacture

• Position: The next two digits after the factory code

• Meaning: Indicates the year of manufacture.

• Example: 70 = the year 1970

4. Production month

• Position: Numbers and letters with hyphens (e.g., 0-A)

• Meaning: Month of production, in alphabetical order (omitting the letter "I")

  Code	Month
  A	January
  B	February
  C	March
  ...	...
  M	December

• For example:

  • 0-A = January 1970

  • 5-C = March 1975 (if the year is 75 )

5. Engine Code Number

• Position: Last 3 digits

• Meaning: A unique identifier for each type of engine.

• Lookup: This code can be used to find detailed technical specifications online.

Example of a complete ID card:

390C70-0A215

• 390 = Capacity 390 CID

• C = Cleveland Plant

• 70 = 1970

• 0-A = January

• 215 = Specific engine type code

With a small ID tag, you can find almost all the original information about the engine – from size and place of manufacture to the date of manufacture. This is an extremely useful tool when you need to repair, restore, or replace parts precisely.

Part 2: How to determine the year of manufacture and model of a vehicle through the casting code.

Step 1: How to find and read the 9-character Casting Tag on a Ford engine.

In addition to the ID card, the molded code is an extremely valuable source of information that helps you better understand the engine type, vehicle model , and choose the right replacement parts if needed.

What is casting tagging?

• It is a 9-character code that is molded directly into the engine block when the engine is manufactured.

• This code indicates:

  • Year of manufacture

  • Vehicle type

  • Engine line

  • Type of spare part (intake manifold, engine head, etc.)

Casting code location

• It's usually located on the side of the engine , either on the left or right.

• On older models, this code may be obscured if the engine is still mounted inside the vehicle.

• Use a flashlight and an oil-removing cloth (or mild degreasing agent) to clean and see more clearly.

Example of casting code:

C5AE-9425-B

Decoding:

Ingredient	Meaning
C	Decade: C = 1960s (D = 1970s, E = 1980s…)
5	Year: 1965
A	Vehicle type: Ford (A)
E	Technical department/vehicle type
9425	Part number (e.g., 9425 = intake manifold)
B	Second version/revision

Checking tips

• If you don't see the code:
  Use a clean cloth or a mild degreaser to clean the area where the code is suspected to be present.
  Use a small flashlight to shine along the body of the engine.

Summary of the benefits of casting codes

• Identify the correct type of spare part.

• Knowing the engine's life cycle

• Useful for restoring classic cars and checking engine origins.

Hint: Combining the ID tag and the mold code will give you almost absolute certainty in identifying the type of engine you have.

Step 2: How to read the year of manufacture from the Ford engine identification code (ID Tag)

One of the most important pieces of information you can glean from the ID tag is the engine's year of manufacture . Here's how to read the specific decade and year from this code:

Production year code format:

Letter + Number (e.g., C9, D4, E3 )

1. First letter → Production decade

Alphabet	Decade
B	1950s
C	1960s
D	1970s
E	1980s
F	1990s
G	2000s

2. The digit that follows → The specific year in the decade

• These are numbers from 0 to 9 , representing the last year of each decade.

Example of how to read the code:

Code	Meaning
C9	1969
D4	1974
E3	1983
F0	1990
G7	2007

In short:

• The code starts with a letter to identify the decade.

• This is followed by a digit to identify the specific year.

• This is the quickest and most accurate way to find out the year of manufacture of a Ford engine.

Tip: By combining this year information with the casting code or valve cover bolt number, you can easily identify the correct engine make and model.

Step 3: How to read the third character in the casting number to understand the Ford engine design.

The third character in the engine casting code is a letter , representing the basic engine design suitable for the vehicle type or product line. Here's how to decode these characters:

The meaning of the letters in engine design

Character	Engine design / Vehicle type involved
A	Generic, full-size engine
D	Ford Falcon
E	Truck engines
F	Engine used in the Trans-Am racing series (overseas)
G	Comet (1961-1967) / Montenegro (1968-1976)
H	Heavy trucks 1966-1982
J	Ford Industrial Engines
L	Lincoln
M	Mercury
O	Ford Torino (1967-1976) / Ford Fairlane
S	Thunderbird
T	Truck
W	Cougar
Y	Meteorite
Z	Mustang
6	Pantera

Note

• This character should match the type of engine being fitted (for example, Mercury engines usually have the letter M ).

• However, you may also encounter cases where the engine is detached or the vehicle has been redesigned, so the markings may not match perfectly.

For example:

Code E5M :

• E = Truck engine

• 5 = Year of manufacture

• M = Mercury

The third character in the casting code helps you identify the engine design type, thereby providing a clearer understanding of its purpose and compatible vehicle models. This is an important detail when looking up or finding suitable parts.

Step 4: The meaning of the fourth digit in the Ford engine die code.

When reading the casting number, the fourth digit must always be the letter "E" . This is an important convention for identifying the type of part.

Explain:

• The letter "E" in the fourth position stands for Engine .

• Therefore, when you look at the casting code on a Ford engine, the fourth letter must always be "E" to confirm that it is the correct engine part.

Summary:

Letter position	Meaning	True value
Wednesday	Type of part	It's always "E"

Note: If the fourth letter is not "E", it is likely you are looking at the wrong part number or part number, or it is not a standard Ford engine part.

Step 5: How to read the last 4 digits in the Ford engine die code.

After reading the first four characters, you will see the last four digits in the engine casting code. This is a very important number for identifying each specific part of the engine.

The meaning of the last four digits

• It always falls within the range of 6000 to 6898 .

• This is the part number for a generic engine assembly.

• Each number represents a specific part of the engine, such as the cylinder head, engine block, intake manifold, etc.

Summary:

Location in the code	Meaning	range of values
last 4 digits	Engine part number	From 6000 to 6898

For example:

• The code 6425 may represent the intake manifold.

• Code 6800 could be a code for another part of the engine.

The last four digits help you pinpoint the exact engine part you're looking at or need replacing, which is very useful when finding the right replacement part.

Step 6: How to read the last letter in the Ford engine casting code to determine the specific version.

The last letter in the casting code is usually the version designation for the engine part you are looking at.

Meaning of the last letter:

• A : The original (first) version of the detail.

• B, C, D... : Subsequent revised or improved versions.

  • For example:

    • C is the third version (A = 1, B = 2, C = 3).

• The symbol can be up to 3 characters long , combining letters.

  • For example:

    • AB is equivalent to version 28:

      • 26 initial versions from A to Z

      • The next two versions (AB)

Summary:

Last character	Meaning of the version
A	Original version, first edition
B, C, D...	Versions 2, 3, 4...
AB, AC...	The next version after Z (28, 29...)

The last letter tells you which version of that part it is , helping to pinpoint the exact details and improvement history of the engine.

Author: Tom Eisenberg .