As far as I can see its basically a 9FXEY engine with a 1200 prefix. My GT project with a 1200 prefix engine number has the side covers. The parts list shows the internals as the same as a 9FXEY engine. Tuftrided crank using the 1505A large journal casting machined to S specs - AEG 479/AEG 480, same as the MK2 S engine I have. IIRC, these are basically UK MK3 S engines. My Clubman parts book, PUB 1052 Dec 1972, pages PUB 1052 (iv) & (v) devotes a section at the front explaining the "rationalisation" of engine numbers for all Mini variants. It doesn't have any info about the 1206 prefix engines. It makes one think perhaps the people involved in this went on to work for Microsoft.
RonR
_________________ 68 build Mk1 Cooper S
72 Clubman GT project. Total restoration required
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