I'll say this once more -- so you don't get caught the way we did a few years ago. We entered in a class where there was no record listed in the rulebook, thinking that therefore it was an open record. We ran (and qualified, of course), then made the return run. Upon entering impound the second time the official record book was opened -- and lo and behold, there was a record in the class after all -- it just didn't get printed in the rulebook.
Lesson: Don't take the absence of a record as proof that there's none -- check carefully before spending time, money, and lots of excitement.