Pressley was 8 of 11 from distance and the Pilots made 14 of 30. It was the most 3-point attempts by Portland since Feb. 28, 2004 against San Diego.
Freshman Jazz Johnson came off the bench to score 14 points for Portland. Gabe Taylor added 11 points, Pressley had eight rebounds and Alec Wintering had 11 assists. Portland shot 52 percent from the field and held the Oregon Tech to 39 percent.
Oregon Tech cut its margin to 73-61 on Joel Yellow Owl's 3-point play with 8:22 left. But Portland extended its lead to 89-69 on Pressley's eighth 3 with 4:42 remaining.
Yellow Owl led Oregon Tech with 23 points and seven rebounds. Lavar Moore added 15 points.