I'm going to install an O-200 on my 7CCM Champ using the Wagner STC. I've gotten word through a source that the standard 4-585 (short) and the 4-884 (long) mounts are unsuitable for the O-200 when using the standard O-200 rubber bushing (530740) / seat / washer mounts. The weak area of the mounts being the two upper single tube mount points that will tend to flex with the vibrations from the softer Lord mount system. Has anyone heard of this problem ? The 64-65 model 7ECAs used a beefed up mount, 4-1207. Anyone have info on the later model 7EC LSA mount ?
The Buzz Wagner STC, that I am using, suggests using the 4-1207 mount or constructing your own mount from drawings supplied in STC. The DIY mount drawings look like a copy of the original 4-585. No supports at the upper two mount points. With the STC supplied drawing, I know that technically, I would be legal with either the 4-585 or 4-884 and or the 4-1207. I would prefer to use a 4-1207 mount or modify my 4-884 mount to an equivalent. Whadda ya think ??