Perkins nomenclature chart.
Detroit Diesel (GM – General Motors) nomenclature charts.
The engine model number is found on the engine block. Left-hand rotation engines have the number located on the left side of the block when viewed from the rear of the engine. Right-hand rotation engines have the number located on the right side of the block. Most engines
are right hand rotation. Use the engine model number and the chart below to identify the engine.