Re: Why no lock-washers?
The cylinder head and the int/exh manifolds expand at different rates than the block so a ridged mount is not desirable as this needs to be a somewhat flexible joint.
Henry spared no expense on R&D as is observed in the amount of money spent on the 1932 60 HP V8 engine. Almost half a billion dollars. The amount of Model A research was phenomenal. You can bet that if Henry did/didn't do it that there was a very good reason for it. His idea was to pay the highest wages, use the best material, and hire the best people.
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