Just finished changing a dm7653 for a dm7651 climb prop on the 170. I posted about it on the 170 forum page and put some pics on my gallery on this site.

http://www.cessna170.org/forums/viewtop ... f=2&t=6017
Check out the 170 forum for details, but here is the short version.

I like the climb prop. I went from 2200 to 2300 static rpm.
I took about 150 ft off my standard grass takeoff, 2 adults and 3/4 gas. Went from just over 600 ft to just over 450 ft.
Added a nice bit of climb. Overall I think I gained about 15% in takeoff and climb performance but only lost about 5% in top end cruise. Overall the airplane seems to accelerate more quickly, flies less mushy.
I have yet to get over 1000ft agl. Later in the week I will take it up to a 6000 ft msl strip and fly it over 10k msl. Report will follow.[/url]

What engine do you have? I installed an 8042 climb prop on my 145 HP 170B last year, and have been pleased. I should try to quantify the gains, like you, but it has been so long that I forget how the standard prop used to behave.

-DP

That is a pretty impressive change in performance!