[freebeard]

It's a start. www.motortrend.com/news/hrdp-1210-vintage-ford-model-a-b-c-four-cylinder-engines/

There was a time when the whole of hot rodding was based on making old Model Ts and later Model As run as fast or faster than anything in Anytown, USA. For the few who could afford it, a reground cam, improved ignition, and an overhead conversion could make a stripped-down roadster dance to the tune of 115 mph on the dry lakes. Bangers were the hardware to beat, even into the Ford flathead V8 era until about 1938, when hot rodders were able to apply their talents to four more cylinders—and the rest is hot rod history. Their depression-era cost and obsolescence after WWII make them a genuine score today.
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Model A engines are rated at 40 hp stock. They use a smaller crank than their B and C counterparts, and use a gravity-feed or "splash-n-drip" oil system—not a pressurized oil system.

Model B engines feature a larger crank with no counterweights and a four-bolt water pump. They feature a pressurized oil system with direct lubrication to the mains. The oil galleys can be tapped to provide better lubrication for the crank, cam, and timing gears.

Model C engines pick up all of the advances of the B, but feature a counterweighted crank, a lighter flywheel—offsetting the crank counterweight's heft—and a three-hole water pump that will help you eyeball the difference at a swap meet or estate sale.