Quote Originally Posted by chwilliams5 View Post
I bought a Smith Miniplane with no engine. The details from its past are scattered between the logbooks and letters from the builder and subsequent buyers. As far as I can tell it was built and flown in 1971 with an O-235. At some point it got an O-290G and then in 2007 it got an O-290D. Now I have installed an O-235 again. I think it just needs a logbook entry but I have had people tell me it may have to go back into Phase 1. Not sure why that would be since it was built and flew off it's 75 hours with an O-235. I'm not gonna bother the FSDO if I don't have to. What would you do?
So your saying you do not believe you need to do a W/B but just a log book entry?

As mentioned this is all in the Operating limitations as to do when doing an major change. Now I guess everyone will be asking if this is a major change? If it was the exact same engine that came from the airplane and there are log entries for this setup, w/b and such. You could go back to that setup. But seeing how this is not the original engine and I would say not the same prop. In my minds eye you have made a major change. This will require contacting the FSDO.