I seem to remember Briggs were the subject of a lawsuit regarding Hp ratings.. in the last few years they were generally only labeled with cc's and not hp
Its less of the fact they got 6hp out of a 3hp engine, more so that they got 3hp out of a 6hp engine. Makes production cheap when every part is the same, Massive rip for the customer though when you might have had to pay considerably more for the bigger engine when its identical bar maybe a cam as the small engine.
Again this was an 80's onward thing, part of the poor management that ultimately brought them undone this year
