For 1977 a new, prize-winning lean burn version of the TC was developed for the new FA-series Familia, using a carburetor with an EGR valve.
In continental Europe the Econovan/Mazda E-series continued to use the UC engine until at least 1990, in a version which produces 48 kW (65 PS; 64 hp).
[3] In some parts documentations, it is referred to as the D4, however no UC engine block was ever stamped D4.
The original 1966 Luce 1500 used a 1,490 cc (1.5 L; 90.9 cu in) SOHC inline-four with square 78 mm (3.07 in) bore and stroke.
Applications: The 1,586 cc (1.6 L; 96.8 cu in) SOHC NA engine was a UB, stroked to 83 mm (3.27 in).