Small block chevy identification numbers and locations

They might look like this "" or "" or "". The block casting numbers do not have any letters in them. There are sometimes individual letters found on blocks like "GM" or "CFD" for the Central Foundry Division, but they are not part of the block casting number. Also some of the later blocks have the size of the motor shown in liters. You may see a "5. On the side of some later blocks the last three digits of the block casting number are cast into the block, but these are difficult to see when the engine is in a vehicle.

The block casting date indicates when the block itself was cast in the foundry. This date does not indicate when the motor was assembled and then later placed into the vehicle at the factory. The block casting date is usually found on the rear ledge of the block on the passenger side, but some later model blocks have the casting date on the driver's side of the rear ledge. Some of the early big blocks made in the Sixties have the block casting date located on the passenger side of the block near the freeze plug holes.

On these, if the early big block is in the car you will have to get under the motor to see the casting date. Do it while the car is on a lift.


The casting dates look something like this "E 12 7". The "E" stands for the month of the year with "A" being the month of January, "B" being the month of February and so on thru the letters to December. In this case the "E" stands for the month of May, the fifth month of the year and the fifth letter of the alphabet.

The "12" stands for the 12th day of the month. The "7" is the year of the decade. Now unfortunately this could be '57, '67, '77, '87 or '97 depending on which part you are looking at.

For and later V8 engines the Boss is located at the right front top of the engine, on the pad just in front of the cylinder head. Take special note that the letter "I" is often the Roman numeral one when it is used for serial date coding. The LAY prefix indicates the model year. The "A" is for the passenger engine type not truck and the Corvette horsepower cubic inch engine with Powerglide transmission. It is also indicative of being manufactured at the Tonawanda, New York, engine plant as shown by the Y.

Identifying Chevy engines

The last 6 digits are for the sequential production number. There is no correlation between the production numbers and the serial numbers other than higher serial numbered corvettes tend to have higher production numbers.

Casting Number Database Walkthrough

A source identifier "F" for the Flint engine plant followed the serial numbers. Then the numbers 54, 55, 56 for the year of model and then the engine suffix code. Each year page in the Corvette Fact Section will have this information for each Corvette engine code. Chevrolet specified the model year in to be for the Corvette with a 3-speed transmission. However, this has not been verified. As of the use of continuous serial numbering of the engine was discontinued. Engines were prefixed with source designations instead. F for Flint for the to small blocks, V or Flint V8 Engine Plant for the and later small blocks and T for the Tonawanda Plant for the big blocks and later.

The next 1 or 2 digits were for the month of manufacture and after the 01 style was used making the use of 2 digits as standard. The next 2 numbers were for the month of manufacture and then everything was followed by the suffix code. Sometime in a VIN derivative was added to the engine pad.

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Head casting numbers for the 6 cylinder can be viewed without removing the valve covers. The number is located between the number 2 and the number 3 cylinder between the valves, directly above their exhaust outlet port. The valve cover must be removed to view the date code. The date code is the same as for engine blocks. The 8 cylinder head valve covers must be removed to view both the number and the date code. The number is in the rocker area. The date code is read the same as the engine block dates. Special note for aluminum heads; casting dates re usually mold dates and these may not be casting dates.

Aluminum heads also have a W inside a snowflake design, which stands for the Winters Aluminum Foundry Company.

Identifying Dart Heads and Blocks

It should also be noted that in aluminum heads were not available for retail sale. The casting dates, when installed, may not be visible. Some manifolds do not have a casting date. The casting date is the same as for engine code dates except the code does not include a year. On the left manifold for a fuel injection 63 to 65, the manifolds do not have a machined hole for a heat tube. On the right exhaust manifold of the 57 to 65 there is no hole for the heat tube.

The Vehicle Identification Serial Number or VIN plate is attached to the top left hand door hinge pillar below the remote door switch of the courtesy lamp. Phillips head screws attach it and the plate has rounded corners. Very early plates were magnetic stainless steel. The attachment holes were hand drilled. Later the plates were made of aluminum and machine stamping made the holes. Resign overcoats were used to cover the VIN plate and the screw heads were also filled to make it more difficult to remove the plate.

Vin plate still has rounded corners and is attached to the door hinge pillar just below the top hinge and is still attached with Phillips screws. The placement has been moved to the top of the steering column mast jacket. Could you please lengthen them a bit from subsequent time? Usually I do not learn article on blogs, however I would like to say that this write-up very forced me to check out and do it! Your writing style has been surprised me. Thanks, quite nice post. My spouse and i felt very contented when Edward could round up his basic research via the ideas he had out of the web pages.

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