from 1965 through 1968. Bore and stroke was . Applications: 1967 Toyota Corona (Japan) 1967 Toyota 1600GT (Japan) 5R The 5R family was produced from 1968 through 1986. An LPG version, the 5R-LPG, was produced from 1968 through 1983. It is a 2-valve OHV engine. Cylinder bore and stroke are . Output was at 5200 rpm and at 3000 rpm. Trucks such as the Dyna received a version tuned for torque, with a maximum power of at 4600 rpm and torque of at 3000 rpm. Applications: Toyota Crown: third through sixth generation (RS50, RS60/66, RS80/RS100, and RS110). Only with LPG for taxi use in the last two generations. 1969-1977 Toyota Coaster RU18/RU19 Toyota Dyna RU10/RU20/RU30 Toyota Stout RK101 Toyota ToyoAce RY20 Aug 1981–? Toyota Corona sixth generation (RT131), only LPG combined with automatic transmission. 6R The 6R was produced from 1969 through 1974. Output is at 5,300 rpm. The 6R-B was produced those same years, while the natural gas powered 6R-LPG was produced from 1970 through 1973. Applications Sep 1970 – Jul 1973 Toyota Corona RT84/94 Jan 1972 – Aug 1973 Toyota Mark II RX16V – 7R The 7R was produced from 1968 through 1971 with a twin throat down-draft carburettor. The 7R-B was produced from 1968 through 1969 with dual SU carburetors and higher compression. The 7R-LPG was produced from 1969 through 1970. The 7R was similar in displacement and technology to the 4R except the wider bore and shorter stroke of the 7R gave different power characteristics. Applications: 1968–1970 Toyota Corona (RT41 sedan, RT53 hardtop, RT54 hardtop) 1970 Toyota Corona (RT82 sedan) 1968–1970 Toyota Corona Mark II (RT6x) 1968–1971 Toyota Corona Mark II Wagon (RT76D) 8R The 8R The engine was produced from 1968 through 1973. Cylinder bore and stroke was with a five bearing crank. It was also available as the 8R-D, dual SU 8R-B, EFI 8R-E, Californian-spec 8R-C and DOHC 8R-G. It was a major departure for the R family. With a 2-valve SOHC head, it impressed contemporary reviewers – Road & Track praised its quietness and free-revving nature. The 8R engine has a closed chamber head vs the open chamber of the 18R-C. The 8R-B has dual side draft SU-type Aisan carburettors with the float bowl under the body and vacuum activated power valves with strangle plates for chokes and liquid cooled intake with a balance tube. Toyota upped the ante again with the DOHC