How to Identify Chevy Suffixes

The Chevrolet suffix is the end portion of a Chevrolet engine ID code, or casting number. Primarily used on the engine block, the code was originally developed to communicate engine specifics between one department and another. It has since become an invaluable identification tool for those seeking specific engine parts at junkyards and swap meets. The information found within the suffix, which must be referenced to a Chevrolet suffix listing, identifies the engine completely, including the year, original vehicle application and any specifications particular to the engine in question.

Procedure:
1. Locate the Chevrolet engine ID code. According to Nasty Z28.com, the engine ID codes are located as follows: on small block V-8s, the code is located on the block near the font of the passenger-side cylinder head. It may be hidden by the alternator. On big block V-8s, it is above the timing chain cover, and on six-cylinder engines, it is found behind the distributor on the passenger side of the block. An example of the alphanumeric code is "V0107CLT."
2. Identify the suffix portion of the engine ID code. Using the example "V0107CLT," the suffix portion of the code is the last three letters, "CLT."
3. Reference the suffix to a Chevrolet suffix listing. Suffix reference listings can be found at NastyZ28.com and Chevy-Camaro.com (see Resources). The suffix example, "CLT," when referenced to a listing, identifies the engine as a 1973 350-cubic-inch Corvette engine with California emission standards and 165 horsepower.