Is it really that implausible? Nash, you ran with Kenden's yellow bike in Denver; that bike has a stock cylinder, a Boss, and a 15mm Bing, and it's running right at 40. Lindar's going just that fast on a very lightly ported stock cylinder, 15mm Bing, and a Bullet.
That cylinder was a pretty nice one. Hell, it was the one attached to the Maxi you (Nash) sold me. It had the nice dykes ring piston, and I played around with my port timings by adding/removing gaskets until I got the revs I wanted.