Does anyone have experience with these folks? They come highly recommended for Continental Titan engines. I have a Titan XIO 360 9:1 compression 190hp very low time (185hrs) engine which has great compression, all 4 over 75#, but recent boroscope shows some scaly rust on underside of all valves and I may need to get the valves reworked. The engine sat idle for several years while the builder dealt with a heart issue.