A Buick engine is stamped with two different identification codes. One is the engine production code which identifies the engine and its approximate production date. The other code is the engine serial number - it matches the VIN (vehicle identification number).
The 250 V6 engine production code number is between the front and middle branches of the right exhaust manifold. The engine serial number is just below the front of the left cylinder head.
The 350 CID V8 engine number is on the front of the right cylinder bank. The production code number is between the left exhaust manifold and the two front spark plugs.
The 455 CID engine number is on the front of the right cylinder bank. The production code number is between the left exhaust manifold and the two rear spark plugs.
|Engines available as indicated: