Mercury Conversions 75, 90, 115HP

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I've heard of it being possible to upgrade or convert a Merc 135HP to a 150HP with a few modifications. Is it possible to convert between a 75, 90, and 115HP with mods? Has anyone done it? I know that the engine specs are identical between the 3.

75HP 90HP 115HP
Max RPM (WOT) 5000-5750 SAME SAME
Cylinders 3 (in-line) SAME SAME
Displacement (CID/cc) 92.96/1526 SAME SAME
Bore & Stroke (in) 3.63 x 3.00 SAME SAME
Bore & Stroke (mm) 92 x 76 SAME SAME
Gear Ratio 2.33:1 SAME 2.07:1

Thanks In Advance!

 

[popnbug]

Re: Mercury Conversions 75, 90, 115HP

OK I Messed up! I didn't search well enough to find the answer to my question on a previous post. MY BAD! If anyone has any different answer other than NO IT CAN"T BE DONE. Please feel free to reply.