LRL, thanks for the compliment on my bike. The cases are 1979,cylinders are Trock and the Heads are 1946. It has a 5" stroke,the cam is a Andrews M grind shovel. I put this configuration together in 1986. The bike other than being turned into a Knuckle hasn't changed since 1979. Now I tell you how to pronounce my name. Its from the combination of Cone = Co, Knucklehead = knuck so it Co - knuck pronounce like Conan. I used to ride wit a 1% Club. that bike used to average 20-25,000miles a summer.