In September 1970, the 1.3 and 1.5-L engines were replaced with 1.4-L units. In other parts of the world the 510 was equipped with the J-series OHV pushrod engines. In the US it remained a 1.6. In September 1971 the new, larger, Bluebird U (610) appeared in Japanese showrooms, but the 510 continued on sale as a lower-priced, more compact version. It also received a minor facelift with plastic surrounds for the headlamps, while the 1800 cc models were discontinued, and the chassis code was changed to 510N.