Engine ID Mark

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The engine number is stamped on the engine block itself. It positively identifies the engine size (e.g. A12) as well as the serial number. The mark is always on the left (distributor) side of a Datsun A-series engine, but the location varies with the year. If you do not see the number, wipe the grease off the engine block.

Engine Number

A12 Engine ID Mark 1970-1973

Stamp is below #4 spark plug, on jutting pad
photo: photo: photo:

A12 ID Mark 1974-1995

Stamp is below #2 & #3, center of block, above fuel pump

A12A ID Mark 1979-1982

Stamp is below #4 spark plug, on vertical pad

Early A14 Engine ID Mark
Early Tall-Block
Stamp is below #4 spark plug, aft of distributor

Late A14 Engine and A15 Engine ID Mark location
Late Tall-Block
Stamp is below #2 spark plug, forward of distributor

Matching Numbers

If the engine is the original one, the serial number will match that on the Model Number Plate.