Pacheco, who competed at the 2004 and 2008 Summer Olympics, capped a polished series of dives with his most difficult, a forward 4-1/2 somersault tuck, to score a total 483.35 points in the men's 3m springboard.
The silver medal went to Mexico's Jahir Ocampo (442.15) while Canada's Philippe Gagne (421.20) took bronze.
Espinosa, a two-times Olympic medallist, sealed her win in the women's 10m platform with a back 2-1/2 somersault 1-1/2 twist on her final dive to score a total 383.20 points.
Canadians Roseline Filion (377.60) and Meaghan Benfeito (357.45) won the women's silver and bronze medal, respectively.
The two events are among a handful of disciplines in 10 sports at the July 10-26 Pan Am Games that offer athletes a chance to secure a spot in the Rio Olympics, which are scheduled for Aug. 5-21 next year.
(Reporting by Frank Pingue, editing by Greg Stutchbury)
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