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Geoff Case

Hi My old Brum (frame S 1100 also July 57) had a DPY engine with a “square” head, so the change from rounded to square is not “set in stone”. Some later bikes were also fitted with DPY engines with rounded heads. Probably “to hand” from the old Shipley stock. I don”t think any Holder built DMS engines were supplied with rounded heads originaly.