Hi Justin. The speeds I got were almost identical. 165 mph cruise, about 180 balls to the wall flat out. The difference is the soob burned about 7 gph at cruise, the corvair seems to burn 4.8 to 5.5 gph at cruise. I am flying with the same prop that the soob turned and both engines were about 100 HP. The corvair climbs better and seems to get on the cam quicker and produces tork a lot quicker. The engine all up flying weight soob 247 lbs, corvair 250 lbs. I am sure I could cruise up near 180 if the plane was 100 lbs lighter. KEEP IT LIGHT is what Ken said and over the years it has somehow put on weight. Steve
