OK guys, Got a good one for you. The 'C' Model that I have been restoring & assembling for the past two years was getting close. We were fitting the cowling on, and having a very difficult time making it work. The zero time engine that is on it, has been hanging there about 6 years, so we decided to change the mounts. Here is where the problem begins: I obtained a new set of the standard Continental mounts, we hoisted the engine & begin to replace them. To our surprise, what was in there was a set of larger Lycoming mounts! This assembly included a bolt spacer. I appear to have a case that nobody has seen before. The most current logbook (starting in 1966) lists the engine as a C-75-12, Serial #276-5-12. Data plate says the same thing. The case is slightly different than another one that I have w/ serial #4XXX. My case was built on 3/12/1946, and both halves have casting numbers one digit off. So, did someone filed modify this case somewhere in the past 60 years or do I have some kind of mutant? It appears the Lycoming mounts will work, I just can't find a legal basis for it. Unfortunately, if I can't come up with a Legally (FAA) acceptable solution I feel compelled to remove/replace this zero time engine and sell it to an EAA guy or for parts.
I would love to hear options, Rick Eason
