hee hee well yeah, a 648 number on the cam means it`s a 649 grind , which was the old factory full race cam so i`m not surprised that it went hard a little donk like that with such a big cam ,,not that it`s massive by todays standards but it`s quite still huge for such a little motor, so it`s no wonder

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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.