Thanks, Rich and Jim, about info on the valve actuation method. It is interesting and I will post what I find out.

Mike, Tiny, and Dennis, race bikes are like wives. One is more than the average guy can take care of. These Triumphs are pretty plain vanilla when they are standard. The gas mileage is real good, however. Other than the pipes, and a swap to a 790 intake cam, I will leave it alone.

The drag horsepower formula in Bradley's "The Racing Motorcycle" is rearranged to give me the drag coefficient. First, I calculate the rpm I was running through the mile, I get the horsepower at that rpm from the dyno chart, and I read the speed through the mile from my timing slip. Second, I subtract the rolling resistance power loss from the total power to get the aero power loss. Then I figure out the aero drag coefficient. Years of dinking around with the fairing and tail has reduced the coefficient by half.

The fellow who did my valves, guides, springs, and seat work at Kibblewhite offered to flow test the head. This info I can pass along to Triumph Performance to get a new set of cams or to have some ground. This data will be a big help.