Prop difference?

[spareparts]

if your boat jumps his, and you are only showing 3500 at WOT, your tach is bad(or miss adjusted). What pitch is he running? BTW, base timing should be no higher than 4 degrees BTDC if you are running 87 octane . I've run them as high as 9 degrees but that was with good 89 no ethanol fuel in a light boat with a different carb, protonix ignition, colder plugs, and a very special prop