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Engine Serial Number Lookup Chevy

The identification number contains a combination of numbers and letters and is seven or eight characters. The prefix explains the location as well as the date of the Chevy engine's manufacture. For example, a Chevy engine with the identification number S1029CTY was manufactured in Saginaw (S) on September (10) the 29th (29). You can identify a Chevy by the numbers on its engine block, recorded in an official Chevy engine block registry. The identification number consists of a seven-to-eight digit code. The prefix consists of five digits and explains the date and the location of the Chevy's manufacture. What You Can Learn From Small Block Chevy Casting Numbers All engines are stamped with an ID serial number showing plant code, production date, and suffix code. The suffix tells you application, original model, Engine RPO, and HP and transmission that were originally mated to the engine. Every Chevrolet car has a unique identifier code called a VIN. This number contains vital information about the car, such as its manufacturer, year of production, the plant it was produced in, type of engine.

EngineChevy engine suffix code decoder

The Casting Numbers to the right are found just below and to the right of the Distributor on the passenger side. They are notoriously very hard to read and often people make the mistake of thinking a '3' is an '8'. Clean the area thoroughly and use a nice bright flashlight. This is usually a 7 digit number and each letter/number is about 1/2' tall. A little engine degreaser and a wire brush often makes this job easier.

Engine Serial Number Lookup Chevy Engine


The next numbers we need are the ones just below the Starter on the passenger side. This one will have a CONveyor Number and beside that a usually four digit letter/number combination separated like this: X XX X. For example, the first X will be a Letter from A through L. A = January through L = December. The center two digits are the day of the month. The final digit is the year the engine was made WITHIN the years that you narrowed it down to when you deciphered the Casting Numbers to the right.

Chevy Engine Suffix Code Decoder


Engine Serial Number Lookup Chevy Impala

The next set of numbers you will find helpful are on the flat part of the Distributor Deck. This machined flat area has serial numbers stamped into it. If you have looked very carefully and find no numbers there, chances are your block is classified as a Replacement Block and will have no numbers stamped on that deck. The numbers you are looking for are stamped (about 1/4' high) and usually a Letter followed by three Numbers and ending in another Letter (or two). The first letter is almost always F since most GM engines were made in Flint, Michigan. The following numbers are the month first followed by the day of the month. The trailing letters denote what the engine was installed in. The possible Letters for the last ones are explained in the chart below.