Can a starter motor that has been left for decades seize and stop a V8 turning by hand . I have the rad out and a 15/16 socket on the crank with a 2 ft bar . no turn . In neutral , also put some engine oil in the bores 4 days ago.Water pump turns ok also alternator.
more to do with when power is supplied to the(starter) motor
ie inertia is spinning as it engages /meshes
pre engaged meshes before power is applied(solenoid has a secondary pull which closes the contacts to power the motor)