Thanks, when it took the housing off there were lock washers; but the housing was from 70 or later (casting # on the neck) and on a 65 intake, so I know something had been replaced. I have a earlier housing (Pre- 70) with the casting # on the lip and there looks like there was a washer of some type. I also think it would be a lock washer; but thought someone would know for sure.
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