usually when s&s pumps are installed on an old motor running hydraulics, a passage is blocked with a setscrew, this passage determines whether the top or bottom end gets pressure first, ideally you wanna supply your top end, and only the bottom end after the top supply has been met. it sounds like this wasnt done.
but an old motor wont always generate any pressure, even though tons of oil is being pumped. either way...clogging the tappet screen is most likely what toasted the hydro.
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