prop help!!!!

[dmweyrauch]

I have a 20 1/2 fiberglass boat with a 350 chevy 260 hp I/0 alpha 1 outdrive currently I have a 21 pitch 3 blade alum prop, Top speed is 43 mph GPS at 4900 rpms, Based on that what whould you recommend or am I proped right, what whould a 19 pitch do? any thoughts mostly a pleasure boat, but I like fast.

 

[sublauxation]

Re: prop help!!!!

19P would probably drop top speed. Most important thing to know is what RPM's for the engine should be and make changes based on that. A stainless prop should give you better performance.

 

[usskydvr]

Re: prop help!!!!

I believe your max recommended RPM is 4200-4600 (depends on engine yr/model, check your manual). If that is correct then you could go to a 23 which would drop your RPM about 300-400 and increase your MPH 2-3.