[Purdy Swoft]

The model A was rated at 40 hp at 2200 rpm the model B engine was rated at around 50 hp at 2800 rpm The things that increased the hp in the B engine was the heart shaped combustion chamber. This is what gave the noticable seat of the pants feel. The cam allowed the engine to turn an additional 600 rpm but would not give this rpm increase without the higher cr head. The B carb and manifold was 1/8 larger and the carb had a high speed circuit. There was a small difference in the ports in the block of the model B engine. All of the above mentioned differences only added 10 horsepower. You could only expect maybe three horse power from the B carb if it was used with the B intake manifold on a well tuned engine. You probably wouldn't feel much difference in power with the B carb. Compression is what gives the seat of the pants feel. In other words it is torque that you will feel more than the horsepower that more carb or a different cam will add, They will make a big difference if all are used together.
I think that the dyno test that I read showed that the Snyder 5.5 head alone would add fourteen horsepower to the stock model A engine. This in itself is higher than the model B horsepower