I can think of one potential reason that the folks in inspection/impound won't measure and seal your engine before you make runs. Assuming you ask for a measurement early in the race event -- the inspectors are very busy inspecting and would probably rather get all of the bikes done and racing before taking the time away from that to measure. Ask them a few days after the beginning of an event and they'll be more likely to measure you then.
Remember -- I'm just making an assumption here. Ask the inspectors, email Matt, and keep in mind what I've said.