The visiting Eagles (6-8, 4-7 TVC Hocking) never led in the contest and dropped their third consecutive league contest, while BHS (14-2, 12-2) remained two games behind league-leading Wahama (18-2, 10-0) and in sole possession of second place.
Belpre also claimed a season sweep of EHS after posting a 7-3 victory in Tuppers Plains back on April 11.
The Golden Eagles led 4-0 after an inning of play, then both teams went scoreless over the next three frames for a 4-0 contest through four complete.
After a two-out walk to Jacob Parker in the top of the fifth, the Eagles responded with three consecutive hits to pull within 4-3. Luke Kimes and Tyler Hendrix had back-to-back singles, followed by a two-RBI double from Chris Amsbary for a one-run deficit.
Belpre, however, countered with two runs in its half of the fifth, making it a 6-3 contest through five full frames.
Eastern netted three walks, a hit and a hit batter in the top of the sixth, which yielded three runs and a 6-all tie — but BHS responded with a run in its half of the sixth for a 7-6 edge.
David Warner led off the seventh with a walk, then Greg Barringer came in as a pinch runner. Ryan Shook delivered a two-out RBI single that plated Barringer — tying the game at seven through seven full frames.
Eastern left runners at first and second base with one out in the top of the eighth, but the Golden Eagles took full advantage of their fortunes in the bottom half of that inning.
Erik Waderker and Wes Hatfield led off the frame with consecutive walks, then Tyler Watkins delivered his fourth single of the night — which plated Waderker for an 8-7 win in extra-innings.
Watkins picked up the win for Belpre, allowing seven runs, seven hits and eight walks over eight innings while fanning seven. Joey Scowden took the loss for Eastern after facing just three batters in the eighth inning.
Ryan Shook started for EHS and lasted an inning, allowing four runs and four hits while recording a strikeout. Max Carnhan pitched six innings of relief, allowing three runs, seven hits and three walks while striking out three. Eastern committed the only two errors of the contest.
Hendrix and Shook led the guests with two hits each, followed by one apiece from Amsbary, Kimes and John Tenoglia. Watkins had four hits to pace Belpre, followed by Clay Ullman, Ryan Leasure and Corey Law with two safeties apiece.