Quote:
Originally Posted by Bob Bidonde
The Model "A" oil pump has a 5/8" diameter shaft A-6608. In 1932 - 1934, the B-6608 Oil Pump shaft is undercut to 9/16" diameter between its bushing locations to increase oil flow for the pressurized oil system in the Model "B" engine. Except for the shafts, the Model "A" pump used from May 1928-1931 is the same as the Model "B" pump. The B-6608 Undercut Shaft can be used in the Model "A's" A-6608 Oil Pump, but the A-6608 5/8" Shaft should not be used in the Model "B's" oil pump.
The B-6608 9/16" diameter shaft is a desirable upgrade for the Model "A's" oil pump to increase oil flow. However, I cannot find the 9/16" shaft in any of the Model "A" parts catalogs. Is the B-6608 9/16" Diameter Oil Pump Shaft available from any parts dealer?
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More isn't always better. The stock A pump is more than adequate at doing the job it's intended to do. You do realize the B shaft you site at 9/16" is only a 1/16" different than the A shaft at 5/8? 5/8 = 10/16. Not enough of a difference to give this any thought.
April Fool's?