prop for Evinrude 175HP V6
 

My engine came with no prop at all. It's a 20". Is there a recommended prop for it? Where's the best place to purchase from? I'm thinking aluminum, for now.

I have a V6 15 spline 14 x19 stainless in excellent condition it yours for 75 bucks if you want it. Cheaper if you pick it up ...Maitland and I-4
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I don't think you'll like that 19 pitch with a 175HP. I believe a 16-17 pitch in a 14 1/2" diameter is where you want to start at. I have a 15 out in my shed that is fairly fresh that might work for you(I'm afraid it might be a hair to small for you though). I'm pretty sure that your 175 has a 1.86:1 lower unit which with a 19 pitch prop would put you around mid 50's at the reccomended WOT RPM range. I don't think a 175 will come close to that as that is where a 225 push's one at. A 175 should be able to hit 40 or mid 40's which at 5500 RPM's will be right around a 16-17 pitch prop.

i use to run a 15x15 1/2 on my 175, plenty of power on take off with a heavy load and good top end high 30's low 40

I'll take your advice on that, FERM. I just found an aluminum 14.5x17 for just over $100. Thanks.

Does it make sense to have several props to interchange? For example, if once in a while you were gonna pull wakeboards and intertubes all day? Then would the higher pitch make sense?

You would want a LOWER pitch for heavy loads. The lower the pitch the less it moves forward through the water for each revolution.