That was common practice. Folks in my circles used to do just what you did in checking how to get to the higher HP. Sometimes it was just in the jets. Sometimes the carb tweaks and some intake reed valve changes (easily done) or manifold shapes, or exhaust porting where it wouldn't work all that well in trying to upgrade.
You are talking about the Merc. 1000, Phantom Black Lacquer, the first 100 hp 2 stroker on the American market.......one running dude.
Merc 2 strokers regularly put out 1 hp plus per Cu. In. displacement......the way they managed that was running high rpms. Where OMC had the cubes and ran around 4500 rpms, Merc didn't have the cubes but ran 6000.........as stated by a confirmed transplant from the OMC corral to the Merc.
Ported stainless steel props were a big plus for Mercs. It allowed them to get the rpms up in the "hole shot" making up for their small displacement and then once up and running, where rpms really mattered, they had the propeller pitch necessary to get on down the road. They did up their cubes by 500 CCs in their 150 V6 engines for Bass Boat applications to help in getting those stern heavy suckers up and on "the pad.
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