You have a later model. My F model does not get a GW increase. I tried
to to find anyone with data to support a GW increase on pre 68 models.

Regards, Ross
C-172F 180HP
KSWI


argon39 wrote:
Putting a CS prop on a fixed-gear bird will not get you any
appreciable speed.


The only thing it buys you is takeoff/climb performance, and unlikely
to have increased your legal gross weight any.


I never said that the prop did either of these things. What did change
things was putting a 180hp O-360 in the place of a 150hp O-320. The
extra 19hp at 65% power does in fact make it go faster. And the new
legal gross weight per the STC is now 2500.