Need to buy a prop

[Les Young]

Fishincreek, It's a 1992 70 hp Johnson on a 1993 Sprint 255. The aluminium prop that I broke was a 13 &1/4 by 17. I tried a 13x19 aluminium last night & it ran 2 mph slower & had to trim it really high to get that turning 5800 rpm. I think stainless would get more bite & get me more top end. Thanks

[fishincreek]

Sounds like a 19 is too much. My guess (I'm no expert) is you will need to go down in pitch if you go stainless(15). Depending on what type of water you fish, you need to keep in mind the gears in a 70 are not near as heavy duty as bigger motors and whatever took out your al prop may have taken you gearbox using a stainless.