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86.7 and 87.5 mm bores were nickasil cylinders. The earlier 2.3 may have been either nickasil or chromal. I would have expected most of the ST's if not all of them were twinplugged.
Are you thinking of building one?
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Aaron.  F.S. 1965 Solex engine w carbs/cleaner
Burnham Performance
https://www.instagram.com/burnhamperformance/
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