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![]() The numbers really don't mean much anymore. Small Block Chevy Engine Block Identification General Engine Block Specifications While 6 different bore size blocks have been produced, the small block engine can be classified into 3 bore sizes and 3 main bearing sizes. ![]() The same "010" block was used on everything small block Chevy in every possible configuration from Corvettes to station wagons to pickup trucks for over a decade. You can ID the pieces but you will never know what they all are unless you take it apart. KaelBottom line is you have a "Heinz 57" engine. This ledge is below the deck of the block and the ledge forms the mating surface between the block and the transmission bellhousing. The CMP indicates that this engine was a tune port injected "305" for a 1991 Firebird.Ĭan someone clearly explain what I am working with? The block casting number on small block and big block Chevy V8 motors is located on a ledge found at the rear of the block, most often on the driver's side. From the information that I have found, I believe that this code indicates that this engine was cast at St. When checking the date code at the front of the block, I see the following K 07 02 CMP. The block casting number at the rear near the bellhousing is GM 3970010 which, according to the information I have found so far, indicates that this block may have been used for any of the following choices: a "302" in 1969, a "327" in 1969, or a "350" in 1969 through 1980. Yesterday, I acquired a small block Chevy engine that I was told was a 358 (350 bored. I have never paid close attention to the dates codes before and now I am simply being nosy I have chosen to post here because this engine will be going into my C3 and I am wondering what my engine actually is.
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