As an owner and operator of a Franklin for the past two years, I can sympathize with your suspicion of the brand. When I first began researching Stinsons I queried the gents on the Stinson forum about my concerns and got blasted for even asking the question. In their view Franklin naysayers tended to be individuals working off of heresay - rarely those who had actually owned and flown one. I flew behind a variety of 165s when I was looking for my Stinson and was readily impressed by their smoothness and performance. So I took the plunge...
The good news is there is a support network out there for them. Greg Lucas (cglucas.com) and Bruce Kown are the two names you need to know, and if you have any questions about the 220 you are looking at I would give either of them a call. Even better, their are two gentlemen in Poland (
http://www.franklin-engines.com/) who have already begun producing approved parts and promise to expand their offerings - supposedly to include complete new 220 engines. So the future may be bright for Franklin operators.
Having said all that, I am sitting in a hotel room in Auburn, Ca right now at the completion of a 4-day road trip from NC. It was supposed to be a cross country to relocate my plane here (grass valley actually), but it ate an exhaust valve on the first leg of the trip. This failure is likely not due to a design flaw, but in considering my options I intend to look seriously at Lycs and Contis.