EF CVCC Motor 1976 - 1978
1976 - 1978 Honda Accords used a 1600cc CVCC (compound vortex controlled combustion) engine. The engine is identified as an EF1-XXXXXXX as stamped on the block. If the motor has EF-XXXXXXX stamped on the block, this indicates the motor was originally installed in a car sold to the Japanese market. These motors find their way into the US when they are imported from Japan to be used as replacements.
EK CVCC Motor 1979 - 1981
From 1979 - 1981 Honda Accords used a 1800cc CVCC engine. This engine is identified as an EK1-XXXXXXX as stamped on the block. A motor identified as EK-XXXXXXX is a motor that came from a car sold in Japan. The rear suspension was changed at this time as well. The 4 door version of the Accord became available for the first time in 1979.