Saving its best for the end of May and early June, North Penn (17-10) captured state gold for the second time in five seasons.
"People didn't think too much about us all year," Scott said. "We showed them up."
Brad Bertucci opened the deciding half-inning with a walk, Posavec reached on a fielder's-choice groundout that erased Bertucci, and Posavec set the stage for Scott's winner by stealing second on a third strike to Chris Kersey.
Scott, the team's designated hitter, made the Falcons pay for walking Jared Melone by ripping a pitch from reliever Kaylor Kulina into left field. Posavec, after scoring easily, was mobbed by teammates.
"It was an inside fastball, and I just turned on it," Scott said.
Senior righthander Dylan Borawski went the distance for Kevin Manero's Knights squad, which overcame three errors. Throwing 107 pitches, he allowed 10 hits, struck out three, and walked three.
"This is unbelievable," Manero said. "This is such a great group, from top to bottom. Words can't describe it. These guys turned this season into something they'll remember forever."
Trailing by 5-4, Lower Dauphin forced extra innings with a seventh-inning run. Kulina knocked home Jeff Light (bunt single to third base) with a single to left.
In the sixth, the Falcons, who took top honors in the District 3 tournament, cut the gap to one on Kyle Fails' RBI single.
Down by 3-0, the Knights struck for seven hits and five runs in the fifth. Brady West (double), Posavec (double), Chris Kersey (single), Melone (single), and Scott (single) registered RBIs.
The outburst started with three straight hits: Mason Nadeau's double to right-center, Anthony Cameron's single to left-center; and West's double to left.
For North Penn, Kersey went 3 for 5 from the cleanup position, West was 2 for 5 from the leadoff spot.
Lower Dauphin 003 001 100 - 5 10 0
North Penn 000 050 001 - 6 12 3
WP: Dylan Borawski. LP: Kaylor Kulina. 2B: NP-Mason Nadeau, Brady West, Eddie Posavec.
Contact Rick O'Brien at email@example.com. Follow @ozoneinq on Twitter. Read his blog, "The O'Zone," at www.inquirer.com/ozone