I am rebuilding a 1954 Massey TO35. IT has a Z134 Continental Engine. Once I had the engine torn down I discovered that the valve rotators on the exhaust valves were in need of replacement. They do not come with any rebuild kits, and I am having a terrible time finding them. There doesn't seem to be any manufacturers who still make them that I can find, and I am not even having much luck in finding used rotator's. I am hoping someone out there knows where I can find them. I am also wondering if there might be rotators from a differenet make or model engine that might work with the Z134?