I think it might be six flags great adventure.
It is definitely Six Flags Great Adventure. This was a trivia Question at last years Coaster Celebration Weekend at the park. I don't recall the exact number at the moment.
By the end of this year Magic Mountain will be the holder of that record (28). Drat!
You can go to rcdb.com and they have the inversion count
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You are the Weakest Link, Goodbye.
Six Flags Great America might hold that record in a few years...
(They currently have 24)
~TodD~
"Help! Help! I'm being repressed!"