The valve angle, piston weight, rod lenth, port volume and number of carbs contribute nothing in lack of peoformance ability as does the combustion chamber shape.

the down side of the Hemi in N/A use is directly related to the design of it's combustion chamber.
It cannot burn all of the area including that around the sides of the piston dome as quickly as a wedge chamber. The rate of burn is much slower regardless of the compression. There's no way it can burn all that area and make the same power as a B1 55cc chamber.
That is until you add some boost. Then it all turs around 180 degrees