Does anyone know if a 337 is required to move my brakes inboard on my Comanche 250. If so where can I find it?

It takes more than just a 337. There is some work to be done in the gear wells (some metal trimming and a stiffener to rivet in). Call Webco to order the need items. Ray B

Ray, thanks I just ordered the parts!

I completed the brake reversal, added the Lopresti nose gear slipper and moved the beacon to the tail. The best I can tell after several long flights I am getting a 7 knot increase in my TAS. Usually right at 170 KTS at 10000 MSL. I am very happy with the results!

Thanks for the report Mark. I just did the brake turn around on my 250. Have not flown it yet so do not know if I got any increased performance. Sounds like you have a fast Comanche, I'd be happy to see 160 knots at 10,000ft. I still have the MPH airspeed and usually see 172 to 175 MPH at 10,000ft . That's the same speeds my first 250 did 40 years ago so I've been satisfied. But now I may have to get you to update me on what mods you have on your 250 so I can try to catch up to your speed. What should I be doing to add speed? Any tips would be appreciated. Ray B

Besides the 3 that I mentioned the rest were installed by the previous owner. These include: flap and aileron gap seals, gear lobe fairings, wing root seals, windshield and wing tips. I have bought the rudder seal kit but I have not installed it yet. My guess is the brakes made the biggest increase. I bet when you fly yours next time you will be pleased. Probably rigging is the makes the biggest difference between planes of the same make and model.