How to Identify Chevy Engine Block Numbers Locate the engine ID number located on the engine block. The location of this number will vary depending on the engine size. Decode the engine ID number prefix. The number is seven to eight characters long and includes both numbers and letters. Click to see full answer. In respect to this, how do I know what GM motor I have? How to Identify a GM Block Locate the engine ID number. On small-block V8s, it is located on the passenger-side front of the engine block, right below the cylinder head. Decode the ID number prefix. The prefix is five-digits long and begins with a letter. Cross-reference the engine ID number with a Chevrolet engine ID listing. 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. A different set of numbers relate to the 261 block. 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. Also know, how do I identify a Chevy 292 engine? just look at the lifter gallery covers or fuel pump/motor mount location on pass side. if the covers are 6″ it’s a 292 if the are 4″ it’s a 250. if the motor mounts are straight across from each other it’s a 250 if the pass side one is foward a bit, it’s 292.What is a Stovebolt engine?Stovebolt. From Wikipedia, the free encyclopedia. The terminology and the slang usage of Stovebolt refers to three different things: A bolt (fastener) with a slotted head, used in the assembly of wood-burning stoves constructed from sheet metal. A nickname for the Chevrolet straight-6 engine.

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