It all started because I wanted to try a new technology prop instead of that old aluminum club.
A new prop built to Lonie Prinz specs turned out out be a little coarse for my O320. Only 2150 rpm on takeoff, a little low.
I had always wanted more power (who doesn't) so rather than have the prop repitched I bought a freshly overhauled O360.
A couple of Pmags and an injection carb from Rotec and all I have succeded in doing was raise my fuel flow from 40 to 49 liter/hr and not one more RPM.
Straight and level, flat out 2320 rpm, 27in map, same as before.

Did I unecessarily replace a real good O320?

Am I missing something here?

Any suggestions would be appreciated.