The rule book says....
12.I. VINTAGE: GASOLINE āVGā *
Motorcycle engines production date prior to 1956. Flathead, OHV,
and 2 stroke engines must retain the O.E.M. Heads, Cylinders, and
Crankcases originally installed at time of factory production.
Allowable overbore in this class is .050ā (inch).
GASOLINE ONLY. See section 2.F.
My question...
Are there any limitations on modifications (obviously not a supercharger or turbocharger), both internal and external that can be made to "the O.E.M. Heads, Cylinders, and crankcases originally installed at time of factory production"?
Thanks in advance,
Andy