Chevrolet’s six-cylinder engines are easily identified due to Chevy’s efficient engine numbering system. The code is seven to eight digits long, consisting of numbers and letters. The suffix gives the year vehicle, horsepower and transmission pairing, while the prefix gives the date and location of manufacture.
The numbers appear on the engine block, behind the distributor assembly. On earlier 1940s and 1950s models, the engine number may appear next to the dipstick. A typical Chevrolet engine number will read V0225FF; the suffix may consist of either two or three letters—in this case, “FF.”