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[Datsun 1200 encyclopedia]

Engine ID Mark

Revision as of 08:23, 8 February 2023; view current revision
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Category: A-series Engines

Nissan A Engines: Overview | A10 | A12 | A12A | A13, old | A13, new | A14 | A15

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

Left Side of Engine
To about 1980  |  From about 1981
Below #4 plug  |  Below #2 plug


1970-1973 A12 Engine ID Mark is below #4 spark plug, on jutting pad (above starter)
174_50f624caf00ca.jpgUpload click to view 770.jpgAlbum click to view 174_50033e9468514.jpgUpload click to view 174_50f624c1ed952.jpgUpload click to view


Model years 1974~1981 A12 ID Mark, below #4 plug
the pad is flat to the engine

Stamp is below #4 spark plug, on vertical pad
17147.jpgAlbum click to view

Early Tall-Block (A13/A14/A15) has large space between serial number pad and cylinder head
16699.jpgAlbum click to view

A13 tall block (1974 model year)
28747.jpgAlbum click to view

28748.jpgAlbum click to view


Model years 1982-1995 A12 ID Mark Type B is below #2 & #3 spark plugs, center of block, above fuel pump, forward of distributor
23706.jpgAlbum click to view 23705.jpgAlbum click to view

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Late: above fuel pump boss, below #2 plug
18742.jpgAlbum click to view 23704.jpgAlbum click to view

Late Tall-block (A14 or A15) ID Mark location is below #2 & #3 spark plugs, center of block, above fuel pump, forward of distributor
18238.jpgAlbum click to view

Matching Numbers

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