Butch Leitzinger, Rudy Junco and Ken Dobson finished second in another class fight that went down to the final hour. CORE's sister car also took third on the class podium with the trio of Colin Braun, Jon Bennett and Eric Lux.
"Sebring is a place that is very special to have the opportunity to come here and drive," Frisselle said. "Thirty-five years ago my father won this race and it is very special for me. The traffic was intense and without the brilliant driving and hard work from my teammates and CORE autosport, I would not be sitting here. I am proud I got to take part in Sebring history."
Viso drove the final 2:15 and rarely had a lead of over a minute. It was an amazing result for a team with two drivers - Viso and Popow - who had never driven the car before this week. Frisselle had only driven the ORECA once - a victory at Petit Le Mans in 2010 with Level 5.
"We were told when we got here Sunday that we think we have a chance for the championship," Popow said. "And it is here; we did it. We got first place. The team did a professional job and we just drove hard all day."
Alex Job Racing won in GT Challenge at Sebring for the second time in three years. Bill Sweedler, Townsend Bell and Dion von Moltke outlasted the field for a one-lap victory over the team car of Cooper MacNeil, Leh Keen and J.P. Dumoulin.
The winning Alex Job car recovered from a couple of early-race issues that resulted in damaged tires and a spin after von Moltke was hit at the final turn in the 10th hour. After that, however, von Moltke drove a steady and clean race as other challengers fell by the wayside in the race's second half.
"I had to push the last two hours and was able to get a gap, make the last stop and bring it home for the win," said von Moltke. "The car ran flawless all day. The crew put a great car under us, and we delivered."
AJR won at Sebring for the eighth time. The next round in Long Beach marks the start of a new chapter in the team's history as Sweedler and Bell debut a Lotus Evora GTE in the Series' GT class.
"What a way to go out. It is just unbelievable," Sweedler said. "Dion is spectacular and Townsend did a great job. The team put together an awesome car and what a day! It couldn't have gone better."
Green Hornet Racing's trio of Damien Faulkner, Sebastiaan Bleekemolen and Peter LeSaffre placed third.