the steady bar "Bracket" on the cyl head in that shot is a small-bore one turned upside down,,, or at least that`s what it looks like to me
edit for spelling

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No offence intended here but--> anyone writing a book about minis 30 years ago may not have experienced such worn or stuffed-with components as we are finding these days.

You should put your heart & soul into everything you do.

oh & the bar is on the wrong way anyways,,, the bump in the bar should sit to the side to clear the (early type) side plate engine, not upwards

just me being picky tho

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No offence intended here but--> anyone writing a book about minis 30 years ago may not have experienced such worn or stuffed-with components as we are finding these days.

You should put your heart & soul into everything you do.

It has solid chest covers (like the 1100S block) and 1275cc as others have said

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