X-cuse me if I'm wrong, but didn't H-M make up som very ltd. SB's? I know they did a very, very interesting kind of heads: they put weber carbs where the exhaust use to be (Directly into the heads; no manifolds) and the exhaust in the centre of the block. Made equal length & corect pairing exhaust manifold as well.
Oh; I am wrong. It was Gurney- Weslake
http://www.bacomatic.org/~dw/engine/...ney/gurney.htm. Well, I remember H-M did something spectacular as well..... But what?