Re: Float A Motor
Post #3 nails it. The original style rear motor mounts and flywheel housing form the 4th crossmember and increase the rigidity and strength of the frame.
However, the rear mounts generally have developed cracks over the years. If you choose to install original rear mounts, check them carefully for cracks and have them welded up if needed.
All four Model A’s I’ve owned have/had original rear mounts in them. Interestingly - I recently replaced a cracked rear mount in my roadster and noticed a reduction in engine vibration. But….a four cylinder engine has inherent vibration - having the engine balanced makes the biggest difference.
One other consideration - float a motor mounts also electrically insulate the engine from the frame - if you keep the FAM’s you might want to add a ground strap between the frame and engine/transmission.
Jim
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