It took Luis Guillorme 100 at-bats to belt his first major league home run, but even the little-used utility man joined his teammates in providing another dramatic blast Friday night to a Mets’ season suddenly full of them.

Guillorme’s first career homer provided the tying run in the eighth inning, and the sizzling Mets scored again in the frame to earn their eighth straight win, 4-3, over the Nationals at Citi Field.

“It’s a great feeling, especially the way the situation was, that was great for me, and it helped the team, too,” said Guillorme, whose milestone ball already was in a case in his locker after the game. “It’s always one of the spots you want to be in, to try to tie or win the game. It was really fun.

“I don’t hit many of those, but it was a great feeling. I think that was one of the balls that I actually knew off the bat that it was going out.”

Guillorme had totaled just 32 at-bats with a .156 batting average in five stints with the Mets this season before Mickey Callaway sent the lefty-swinging infielder to pinch-hit for Juan Lagares with his team trailing 3-2 in the eighth. Of course, Guillorme crushed reliever Fernando Rodney’s 3-2 fastball into the right-field seats to tie the game.

“Outstanding,” Callaway said. “One of the reasons we wanted to keep Guillorme was so we’d have a left-handed bench bat, and he came through big tonight.”

Indeed, Adeiny Hechavarria was scheduled to earn a roster bonus of $1 million on Saturday, but he was designated for assignment one day earlier — with Guillorme remaining on the roster — after second baseman Joe Panik was signed as a free agent.

After Guillorme’s homer, Panik reached on an error before scoring on J.D. Davis’ sacrifice fly to right.

Davis said that he had sprinted to the dugout from the video room when he saw Guillorme’s blast on TV. Seth Lugo had surrendered a solo shot to Juan Soto in the top of the inning, but he revealed he “was thinking Luis was gonna hit his first” homer against Rodney.

“I’ve been talking to him about it, because I had one first,” Lugo said of his lone home run in July 2017. “I knew his was coming any day now, especially the way he hits [batting practice]. … I think he might hit the ball farther than Jeff [McNeil] in BP.”