Make sure that your measurement is done with the housing and the pump body in the final assembled position relative to each other. .2" is still a lot.
On a 11 bolt pump, for example, the plate-to-vane clearance can be as small as the gasket thickness for optimum performance, in fact that's how some members did theirs; adjusted the gap for contact without a gasket, then assembled with a gasket.
George
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