[rotorwrench]

The standard model A crank doesn't have a lot of places to remove weight. The "B" crank or a modified A crank with added counterweights will have a bit more to work with. The clutch and flywheel can be balanced separately but should be indexed to the crank after initial installation checks are completed. Runnout and end play should be checked on everything. Equalizing weight on the pistons and rods is a blueprint tactic and a person doing the balancing on a machine can calculate the bob weight mass from those figures.

The model A or B engine doesn't have a lot of mass in it's rotating assembly when compared to a V8 so they generally can work from their original balance at Ford. It's when parts start getting mixed & matched or modified that there can be problems.

Aligning the clutch housing with the crankshaft flange is another thing that is sometimes taken for granted. If the transmission isn't aligned with the engine, it's going to have problems. When things are right, the model A engine is pretty smooth.