Based on the technical context of the query, it is likely that "piece covering 755" refers to a specific manual or part related to the (or Lycoming R-755) radial engine.
: Lists of components, such as rocker box covers or internal engine "pieces" that cover specific assemblies of the 755-series radial engines. 755.rar
: Archive files containing technical drawings or installation steps for aviation or industrial lighting systems (e.g., "Installation manual of R series light.rar"). Based on the technical context of the query,
Could you clarify if you are looking for a or a digital technical manual for the Jacobs R-755 engine? Installation Manual - Blue Vision LED 755.rar