I happened to catch this yesterday on ebay right before it closed. Some knucklehead cylinders that went for big bucks.
http://cgi.ebay.com/ebaymotors/ws/eBayI ... K:MEWAX:IT
They certainly appear to be different than the ones usually seen - at least the ones I've seen in my very limited experience. Does anyone know anything about them? My only real reference is Palmers book and there is no mention of them that I could find. I'm just curious.