On the left a Custom designed cam with an adjustable sprocket, produced at Megacycle. On the right a stock cam. The final step was a redesigned cam geometry. 450 motor all along. There are some pressure angle problems in the geometry, which is why the valve train rockers wear out, especially the short side radius on the exhausts.
People think that they just plain wear out, but there's more to it than that.
It wears out on the closing side of the exhaust valve because the pressure angle is so rotten. Nobody can tell you what the pressure angle is except somebody who designs cam-shafts. Augustine spent hours on a CAD system with master cam builders from Megacycle Cams designing and perfecting the cams for the Henning Honda. While fitting of the final cam shafts required no major matching be done to the head, Augustine is quick to point out that without all of the other work he had done to the engine the new cams would be worthless. When the top end was complete it was returned to Todd Henning to be installed on his specially designed and blueprinted close-ratio bottom end.