Though a firm believer of the "If it aint broken, don't fix it school" I did want to have a peek inside. Dismantling a Norton OHC engine is not difficult; it takes no more than 8 bolts to remove cambox, head and cylinder.
No disasters yet! This looks like a used but well-maintained engine. Quite special is the bronze cylinder head, probably somewhat more modern than the 1932 (confirmed by the VMCC) crankcases.
More to follow!