How to find the foundry number

Casting numbers are impressions that manufacturers create on the block or cylinder head of an engine. These numbers are embedded in the mold and are part of every engine casting produced. Using the casting number ensures the correct parts are selected for assembly.

ENGINE BLOCK CAST NUMBER

The engine block casting numbers aren't always easy to find. They may be covered in grease or dirt, and you may need to clean part of the engine to locate them. These numbers are also difficult to read when the engine is still in the vehicle/boat. You can try using a mirror if the numbers are located in hard-to-see or hard-to-reach places.

Engine block casting numbers do not contain letters except for FORD engines (e.g., E9AE) and the GM 4.3L (262 cid) metric which ends with 090M.

WHERE TO FIND THE FOUNDRY NUMBER

For Chevrolet (GM) engines, the engine block casting number is usually located on a lip at the rear of the engine and contains 6 to 8 digits. This lip is located near the clutch bell housing. On some engines, the last three digits of the casting number are cast into the side. The last three digits of the foundry number are the most important.

For FORD engines, the engine block casting number is usually underneath it, making it impossible to read if the engine is still in the vehicle/boat.

CYLINDER HEAD CAST NUMBER

The cylinder head casting number is located on the top of the cylinder head. The valve covers must be removed to see the casting number. Keep in mind that if you remove the valve covers, you may need new gaskets.