Right. Hitachi had been making "Almost" direct copies of SU's, under license for Nissan since 1962. The last, true Brit SU fitted by Nissan U.S. to a 1960 SP212 Fairlady, being prepared for racing. The first Hitachi SU copies were fitted to the SPL310 in late 62. The frist few cars had only 1 SU, changed to 2, mid year 1963. During the period 1959 ~1965, Hitachi was Nissan's largest contracted manufacturer. Disassembling an early Nissan, you get the impression that it really should have been fitted with the Hitachi sun, instead of the Nissan/Datsun logo! They were suberb carbs, many retain the belief (myself included) that they are superior in Quality to the Brittish patent (that should get me in trouble). The infamous "Tuna Cans" fitted to the US 1973 240 and later 260's, were such a departure in design that we just refer to them as Hitachi's.