12hp vs 14.5hp Briggs engine. Is there actually a difference in power ( I don't think so). Experts?

Whether it's a 12 horsepower, 13 horsepower, 14 horsepower 14.5 horsepower, 15 horsepower. Rhe debate continues, is there actually any difference in power between any of those engines? If there are any experts on this out there watching please weigh-in or ex Briggs employees, however in the years I've been working on these engines, no, I do not believe there is any difference. They are all 28 cubic inch, 465cc, same ratings. The only difference I believe they're actually was, is where the manufacturer set the RPM, which is adjustable on all of them. There are no differences in parts or anything else asides from the 12 vs. 13 horse Flathead the, 13 horse does have a larger flywheel screen, does the 13 have more power the 12? It's the only one with a difference. That's the only difference out of all of them, aside from that even those two are 28 cubic inch, 465cc engines. Where is the difference? There are none, it was a numbers game in selling the machines. There's a known lawsuit for over rating them and even after that I'm still seeing it on some of the newer engines on lawn tractors. 14 HP end up or overhead valve vs. Flathead, but that's just a design difference, not a difference when it comes to power. Feel free to weigh in on the discussion, I'd like to hear other people's opinions, as well as any actual knowledge on the topic.

[@mattb9664]

I think I figured it out. The small engine is the same in a product line, but when the transmission and deck size go up in models, the engine becomes more loaded and it will pull more power. So the equipment manufacturer is allowed to say that the engines have more power for the higher models trims with heavy duty transmissions and wider decks with longer blades or more spindles.

[@kolakoskifarm5323]

I thought the 12hp was a flathead and the 14.5 is ohv which is why it has a little more power

[@willefixit]

difference is decal? in my opion

[@nickflopper]

They are basically the same. The carb jetting may be a bit different, but nothing to notice. Remember the briggs quantum flathead is the same displacement as the ohv Quantum, the pistons are the same exact part number. But they are rated different hp. Horsepower goes up with time, like in the early 90s the quantum was rated at 4 / 4.5hp and in 2015 they got up to 7hp, sometimes called 8.0, but the same exact displacement. Same goes with the opposed twin engines. Hp numbers just go up on the same engines.

[@ketilkreybu122]

restrictorplate in intake for the 12hp

[@joeydepalmer4457]

So, what you all are saying is i can replace my 14.5 with a bigger engine? how much bigger?