Re: oil pump spring
Ford likely made model A engine oil pans for a while after the change over to the model B pan. They started farming out the engine blocks after production ended, hence the diamond blocks. They manufactured the model A type 4-cylinder clear up to 1941 so they may have farmed out the oil pans for the industrial engine line and spare parts as well. Early model A engines had the clean out in the pan but the spring on the bottom of the pump was common till the end of model A car production and likely on into the model B production
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