Great thread chaps! stumbled in by accident, good fun reading so far.
A couple of comments which might muddy the waters further...The MGC used a 6 cyl engine very similar to the Healey 3000 unit, in fact sharing piston dimensions but not a whole load else (from memory). Can't remember the BMC engine designation but it's not the 'C' type engine...that's the Healey 6 cyl engine designation, a much older generation motor as per the 'A' and 'B' series engines of similar period.
Relevance? well, Abingdon commisioned at least two aluminium blocks for the Healey BJ8 works rally efforts, and I think one was fitted to the stillborn '67 RAC car which Arthur Carter owned. The other/another we resurrected for Chatham in the '80s and stuck some new liners in.
However, I don't recall ever seeing an all-alloy MGC engine, but terribly happy to be corrected - damn I wish the memory worked better!
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