Yes, David, I think Ray's posting gives you these figures, though without assigning propellers. The data I posted are for a BH with "Perry scavenging", what essentially means Perry Directional Porting, PDP. The textbooks show Perry porting with a baffled piston, and the engine in my book is baffled as well. (AFAIK, only Schnürle does without baffled piston.) I think the data could apply to your engine, particularly if it has a hard chrome plated steel sleeve. It should be one example of the long-standing G 60 series. The changes were made to the carburetor, the piston (cast or forged), the porting and maybe other things. That's meant to be the reason for the +/-20% differences in power. By the way, my book explicitely mentions that the G 60 was especially popular in the US.