Nissan NA engine

The Nissan NA family is a series of straight-four engines manufactured by Nissan Machinery as the replacement of the Z series, on which its design is based. It is mostly used in commercial vehicles because versions with a P suffix code run on liquefied petroleum gas. It is entirely unrelated to the 1950s NAK engine. Applications the article lists include the Datsun Truck D21, the Nissan Atlas F22 and F23, and the Cedric Y31 and Gloria Y31 sedans.