The engine is a Continental. It has it's own type certificate and publication suite.
http://rgl.faa.gov/Regulatory_and_Gu...20rev%2021.pdf
The POH for a Piper aircraft may only be of limited use. They are generally very basic, perhaps not as much as the rudimentary schematic above.
These are only rated figures, not necessarily related to developed power.
I am sure the Continental books will have more info, the engineers will have swags of them.
The LAME would never refer to a Piper publication for a engine issue, and the POH not much at all. Perhaps for the tyre pressures on a strange aircraft....