Chevrolet Big Block Engine Code Location. The engine code designates the assembly factory, the date of assembly, and the vehicle model it was installed in. GM Division CodeĦ = Cadillac Chevrolet Assembly Plant Codes Last 6 Digits = Equal the last 6 digits of the vehicle’s VIN.ġ23456 = Matches the last 6 numbers of the VIN of the vehicle the engine was installed in. The 3rd digit denotes the vehicle assembly plant, and the last 6 digits equal the last 6 digits of the vehicle’s VIN that the engine was installed in.

The 1st digit represents the GM division. Some Truck or Marine blocks may have the codes stamped on the flat block just above the timing cover. The Engine VIN is a stamped code located at the front passenger side of the block, on the machined boss just below the Head. Chevrolet Big Block Engine VIN Number Location Chevrolet engine produced prior to 1968 may or may not have a partial Vin.

This engine Vin was only federally mandated starting in 1968. The Engine VIN Number is the last 6 or 9 digits of the vehicle’s VIN number. Chevrolet Big Block Engine Identification

Decoding willys stamped engine numbers