Have a set of Merc 4 blades just freshed & back from BBlades 17 X 35 18 degree rake if they'll work for ya make me an offer and can box & ship today:drink:

I love them, they were actually built for my SUV MTI that has alot more weight in the bow. I kept them and ran them on Hammertime and really liked the ride. They seem to hook up a littler better when turning and really carry the bow over other boat wakes. Also no porpoise at any speed.
I rarely use these as I had a new set of 38's built, again with the 20* rake.

Exactly, more rake = more bow lift.
It is basically the angle of the trailing edge of the prop. The higher the rake the further the blade reaches back making the blades longer on the leading edge.. If I set my props down on the trailing edge tips, the back of the prop where the nut goes will be higher off of the surface the props are sitting on than a standard prop.