Just returned from the races. We were at Bonneville Tuesday afternoon through Thursday. The salt was pretty good, although winds shut down the runs for a few hours here and there. We only found one Commando engined particiant, an ex-pat Swiss running a slim line featherbed street bike with a large Commando engine. It had a longer stroke Nourish crank, and big pistons. I think he said it was 960 cc, which is about right for the 91 mm stroke and 82 mm bore that some of the sidecars used to run. He said he bought the engine out of a sidecar outfit, and never took it apart. It ran a mild cam (2S) and small (32 mm) Mikunis, so wasn't really set up for the salt. His best run was 120 mph, as I recall.
Lots more Nortons at the Miller AHRMA race, with several Commando based racers, including forum member Tom Kullen. I didn't catch a lot of the results, but I know that Tom's bike ran really well, and he had some good rides.
Sorry for no pictures. I took my camera, but it died before I got a single shot.
Ken
The 750 Commando