Leaf Group Media About Us Accessibility Terms of Use Privacy Policy Copyright Policy Manage Preferences.When you translate this information, you can find out when and where the engine was made.
In addition, the engine suffix can be cross-referenced to verify the year and body style of the vehicle the engine was built for. Pontiac Engine Block Number Decoder Code Is DifferentThe engine code is different than the longer VIN number, which includes information on the model, body style and assembly plant. Pontiac Engine Block Number Decoder Series Of SevenThis series of seven to eight digits begins with a letter and is stamped directly on the engine. On a small block GM V8, it is stamped in front of the cylinder head on the passenger side. The code is stamped above the timing chain cover on big block V8 engines. Step 2 Wipe any grease or dirt off the code to make sure you read each digit correctly. Step 3 Look at the first digit, which will be a capital letter. This letter refers to the plant that manufactured the engine. There are seven different GM plant codes: F for Flint, H for Hydramatic, K for St. Catherines, Ontario, M for GM of Mexico, S for Saginaw Service, T for Tonawanda and V for Flint. Step 4 Read the next four digits in the code, which will be all numbers. The first two numbers are the month, and the last two are the day. For example, if the numbers read 0107, then the engine was cast on January 7. This will be two or three digits, and could include both numerals and letters; typically it is three capital letters. For example, if your code is CMP, then the reference indicates this is a 305 engine with 240 horsepower. It was built for a 1991 Pontiac Firebird and included the L98 automatic transmission and tuned port injection. If there is more than one entry for your suffix code, then use the engine block casting date code to identify the year of the engine and identify the correct suffix entry. References Nasty Z28: Chevy Engine Code Information Nasty 2z8: Decoding Chevy VIN, Trim Tag and Drivetrain Codes Joes Antique Cars: Chevrolet Engine Block Casting and Identification Numbers Nasty Z28: Small Block Chevy Suffix Codes: CMK - CUD About the Author This article was written by the It Still Works team, copy edited and fact checked through a multi-point auditing system, in efforts to ensure our readers only receive the best information. To submit your questions or ideas, or to simply learn more about It Still Works, contact us. Photo Credits chrome engine image by Thomas Czeizinger from Fotolia.com More Articles How to Find What Year Your Ford Tractor. How to Identify a Ford 312 Engine How to Identify Engine Year for a Ford. How to Identify a 396 Big Block How to Identify a GM Block How to Identify a Chevy 350 Motor How to Identify an LT1 Engine How Can You Tell What Year a Chevy.
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