Top Speed??

[macojoe]

Just finished my conversion of a 1974 V20. It now has a 175 hp Yamaha. I have two 20 gal gas tanks in the sides. I don't know how this system is going to work but will post when I get in the water.
What size props are you guys using?? I was using a 17 pitch when it was a I/O. I have gone to michagain site and sized the prop there and they say I need to use a 15 pitch?? The motor I bought came with a nice SS 19 pitch. But I don't think it will do well. I will try it and see.
With the I/O set up I use to get just about 30 mph with full tanks and 2 people. and about 3 1/2 miles per gal. I am sure that I will use more gas now that I have a outboard.