Pasted below is the section of the "Builders Guide" that addresses the flywheel. The latest "Builders Guide" can be found under "Guides" at
www.modelaengine.com
12) Flywheel
The optional 30 pound flywheel is machined to use the Ford V-8 9- inch Long design pressure plate (48-7563 or 09A-7563) and is balanced. We do not recommend the use of the 8N-7563 tractor pressure plate.
Make sure that the pressure plate is balanced separately from the flywheel. If the already balanced flywheel is needed as a holding fixture to balance the pressure plate, only take material off of the pressure plate to obtain balance. The new flywheel is machined to accept the original Ford shoulder bolts (350433-S) that attach the pressure plate to the flywheel. Longer 5/16-18 shoulder bolts can be used. Shoulder bolts are much stronger in shear than fully threaded bolts. These bolts should use lock washers and we recommend a torque of 18 lb-ft.
The new flywheel does not come with a ring gear installed because the beveled teeth on the ring gear need to be at the rear if using a Model A starter, and at the front if using a gear reduction starter.
We do not recommend the use of a "barrel" tractor starter drive instead of an original Bendix because the "barrel" drive has a shorter throw (distance that the pinion gear moves between rest and extension), and it will not engage the ring gear completely.
The new flywheel does not come with a pilot bearing because some people prefer the porous bronze oil impregnated bushing while others prefer a ball bearing.