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Nissan works engine design: a DOHC A12 engine! Apparently never produced, but was only a design study.
AZ12 DOHC 4-valve head
幻のツインカム、AZ12エンジン
phantom twin-cam, AZ12 engine
This is just a diagram. It seems no AZ12 was actually produced.
1975: inspired by the LZ14 engine of the racing PB210 Sunny, the AZ was intended to compete with the 3K-R DOHC racing engineᵂ
まほろの4バルブA型エンジン「AZ12]
Mahoro's 4-valve A-type engine "AZ12"
Article showing drawing of the AZ12 in Auto Technic magazine 1982 volume 14 no.164.
Top: OHV AY12 engine (single-cam) engine was actually made
Bottom: DOHC AZ12 engine design similar to the Nissan LZ Engine
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