I recently acquired a UP F9 for a great price... I then noticed it had no engine numbers. I browsed the UP site hoping to find a list of engine numbers actually used on F9's, but those listed were only for the current roster. I realize I can probably find this information in books about the UP, but being cheap at heart I'd rather not pay $39 for 10 cents worth of data. Can anyone tell me what numbers UP used on their F9's?