![]() These seven digits are located on the right side between the fuel pump and starter except for 1954 where it is located forward of the fuel pump. A different set of numbers relate to the 261 block. One may also ask, how do I identify a Chevy 261? Casting numbers, not stamped numbers, on the 261 head are very visible beside the rocker arm cover. Cross-reference the engine ID number with a Chevrolet engine ID listing.The prefix is five-digits long and begins with a letter. On small-block V8s, it is located on the passenger-side front of the engine block, right below the cylinder head. ![]() The number is seven to eight characters long and includes both numbers and letters.Īccordingly, how do I know what GM motor I have? The location of this number will vary depending on the engine size.
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