I don't profess to be an expert on the subject, but I have always understood
that the safe limit for reboring on these engines was +60 'thou. If that is
the case, +60 'thou on a 57mm bore with 83mm stroke would give 892cc, still
well short of the PB's 939cc.
Seems to me that to bore another 20 'thou on Dennis' already well over-bored
57mm block is tempting providence.
JOHN JAMES
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