Aside from the normal porting and relieving that was done to similar engines like the Flathead Ford, lightening the rotating assembly(turning the counterweights down), was a trick the Ford guys did, so I would suspect that crossed over to other Flathead guys, regardless of the brand. Its also possible that a weight break was given to Flathead engines over the OHV engines, it was done in other racing arenas later in the fifties, in an attempt the help the Flatty's compete against the 265 Chevy's....perhaps!
