I put a Mooney engine IO360A3B6D on my RV7 instead of an Arrow engine IO360C1C like I originaly wanted. One of the differances between the two engines is the prop position on the crank. On the Mooney when the prop stops it is in the 12/6 position in the Arrow it stops in the 2/8 position. I want to know if anybody knows if reclocking it will cut down on the vibration of the engine. We fly at 23 in and 2300 RPM and the vibration is annoying. Running it at 2450 and 23 is a little better. Any reason the two manufactures clock these props differently? What about the IO360M engine?