Re: 32 model b engine
My '31 has a B engine made in '39...the advantages of the later B engines are hard valve seats, oil pressure to the main, larger journals, etc.
As John Carlton said, the modifications to use the engine are few, and consist of trimming the rear of the B pan. Everything else bolts right up. I just re-assembled mine after resetting the rod and main clearances, and the only gaskets that are different from the A engine are the pan and valve cover gaskets. Motor mounts are the same too.
Mine is direct bolt up to the A flywheel housing and uses the A intake and exhaust manifolds, carburetor, distributor, and the A head with 4 bolt water pump. I also replaced the front pulley with a new one and it is an A unit too. Internally it uses the same cam gear and thrust plunger.
A or B, condition would be the issue for me.
Tom
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