Back with more on the Norris RX cam. Got the cam timing correct now. Seat of pants meter says the engine is stronger than with what the previous owner put in this combat engine...a standard cam. The radical idle from the Norris is gone now with timing correction. Others have said the RX is a full race cam, but I don't notice this. It acts similar to what I recall with my first combat in '73 that was all stock. Particularly the compression braking is very noticable when letting off the throttle. Mid range power is still good and the engine wants to rev going easily passed 6,000rpm in 1st and 2nd. Exhaust sound has changed...lower pitch and more shock wave. With the good results I'm not planning to change the camshaft again this winter....good thing as I wasn't really looking forward to another total engine tear down.
Still have a pretty good oil leak from the front of the head that seems to go away after getting the engine hot. I don't think it's the head gasket, but having a hard time pin pointing the offending cause. It's also not the intake valve cover leak that's typical as no trail of oil going down into the head fins.
Northern California Norton Owners Club
'72 750 Commando combat roadster
2007 Sportster XL1200R