Uprated camshafts for SV Minors

[ayf395]

Oops, ignore the bit about the valve clearance, it is getting late.
A quick measure of the valve lift on the readily available camshaft gives a lift of around 6-7mm with a head clearance of 11mm even with a skimmed head.

[Toby]

4 branch manifold and twin carb on a minor apparently gives 75 mph which would give a closer match to your Norton