Silovs was just as good in his third start of the series. He replaced Stuart Skinner after Pittsburgh lost the first three games of the series and had a .939 save percentage.
"He gave us a chance to win every time he was in," Penguins captain Sidney Crosby said. "'Skins' did as well but it's not easy for a goalie to come in down 3-0 and having the game that he had for a few games. Just give him a ton of credit for coming in and playing like he did."
Both teams had ample opportunities to score during regulation, but each went 0-for-2 on the power play.
The Flyers' best scoring chance came during a Penguins power play during the second period, when Christian Dvorak nearly finished a give-and-go with Sean Couturier on the right post at 6:12, but Silovs made a sliding pad save.
Pittsburgh answered with a strong chance for Egor Chinakhov but his shot from the left face-off circle hit the post at 6:49.
The Flyers began the third period with a power play after Kris Letang was called for roughing at the end of the second, but they managed one shot on goal. Philadelphia went 2-for-17 on the man-advantage in the series, with both goals coming in Game 3.
Michkov, back in the lineup after being scratched for a 3-2 loss in Game 5 on Monday, had a chance on a breakaway but Silovs got a piece of the shot with his glove at 15:26.
"He was awesome," Muse said of Silovs. "Just massive saves. ... For him to come in this series the way he did, it says a lot about how much of a competitor he is."
Michkov then helped set up York's game-winner, the sixth goal by a Flyers defenseman during the series.
"I think everyone's got to contribute, and we kind of have been," Flyers defenseman Jamie Drysdale said. "Yorkie was due. He's a stud. He's been playing unreal all series. His time to shine and boy, did he ever shine.
NOTES: It was the 14th time in the NHL Expansion Era (since 1967), and second time in 18 years, that an elimination playoff game ended 1-0 in overtime. The most recent time was the Vegas Golden Knights' win against the Edmonton Oilers in Game 5 of the Western Conference Second Round last season. ... Vladar's 42 saves are the most by a Flyers goalie in a series-clinching victory, surpassing the previous mark of 41 by Phil Myre in Game 3 of the 1980 Preliminary Round. ... York is the third defenseman in the NHL modern era (since 1943-44) to score his first Stanley Cup Playoff goal in overtime of a series-clinching game, joining Chris Tanev in Game 4 of the 2020 Stanley Cup Qualifiers and Brooks Orpik in Game 6 of the 2013 Eastern Conference Quarterfinals.