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Introduced August 1961, the Datsun 320 light truck was commonly called the "1200" due to having 1200 badges. This denoted the size of the E1 engine, and not the model name or market name. It is unrelated to the Sunny family of subcompact vehicles like the B110 Datsun 1200. The 320 is related to the 310 Bluebird family.

Engine

The E1 displaced 1.2 L (1189 cc) from a 73 mm (2.9 in) bore and 71 mm (2.8 in) stroke. The E1 was produced from 1958 through the late 1960s. The one installed in 320 pickup was rated at 60HP.

The first E engine produced 48 hp (35.8 kW) and 60.7 ft·lbf (82.3 Nm) from a single carburetor. A later E-1 version added dual carbs and better cam timing for 60 hp (44.7 kW) and 67.3 ft·lbf (91.2 Nm).

The first E1 truck to make 60 HP was the 1961 221, but "Datsun 1200" badges were not added until the Datsun 320.

Applications:
E
1958 Datsun Bluebird 211
1959 Datsun Bluebird 310
1959 Datsun Truck 222
1960 Datsun Fairlady SP212

E-1 
1960 Datsun Bluebird 311
1962 Datsun Bluebird 312
1964 Datsun Bluebird 410
1961 Datsun Fairlady SP213
1961 Datsun Pickup 223
1962-1965 Datsun Pickup 320
1968-1969 Datsun Cabstar A320

Engine Swaps

The Datsun J13 will bolt right up to the stock 320 transmission, the only piece you will most likely have to swap is the bellhousing adapter plate. This is the plate that is between the flywheel and the block. The E1 and the J13 have the same block bolt pattern, so the plate from the E1 will go right up to the J13 and then you can bolt up the J13 to the 320 4 speed. You may have to use the E1 flywheel and starter.