I have a '73 CB350 twin, and I'm in the process of rebuilding the motor. I also have another CB350 camshaft of unknown year. The mystery cam came with a basket case that was supposed to be a '72, but the motor has a "Type-1" stamped side cover. I've heard that the early Type-1 cams were a bit hotter than the later models. The mystery cam has a much smaller base circle than my '73 cam. I got out the calipers and did some rudimentary measuring. The base circle of the mystery cam is approx. 0.155" from the base of the cam, and the highest point of the lobe is approx. 0.420" from the base, for a total lift of 0.265". The '73 cam base circle is 0.211, and the lobe is 0.472, for a lift of 0.261. So the mystery cam appears to have a bit mor lift, but from just eyeballing the two cams side-by-side, the '73 cam looks like it has more duration.
The mystery cam has the characters 0, 1, II, and maybe another 1 cast into it. The '73 has I (or 1), 5, E, and either a 6 or a 9 cast into it.
Is my mystery a Type-1 cam, and if so, is it indeed a hotter cam that my '73? Thanks.
