Most of my buddies are into old Harleys. One guy found an original set of barrels from the 30s still on standard bore. Nobody ever wanted them because someone used a long reach drill bit and drilled about 100 "lightening" holes through all the fins.
Last I knew they were cutting off each fin, repairing it and brazing them back on.
20 minutes with a drill, 100 labor hours to repair. But it was mentioned, at the time they were considered "old junk".