Scuderia Corsa and GMG Racing will contest the SportsCar Grand Prix at Long Beach, bringing the total number of entries for the Californian street race up to 26.
Both teams will enter a single car into the GTD category, which is the largest class with seventeen entries.
Scuderia Corsa last raced in the IMSA WeatherTech Sportscar Championship during January’s Rolex 24 at Daytona. The team has entered the #63 Ferrari 488 GTE Evo for Colin Braun and Daniel Mancinelli.
GMG Racing, meanwhile, will make its first IMSA appearance on over half a decade. The team’s last appearance came in 2014, when it ran a GT3 Audi at Daytona and Sebring.
The SRO America regulars will contest the race with the #34 Porsche 911 GT3 R. James Sofronas is currently the only listed driver.
Elsewhere, US RaceTronics will make its series debut with the #26 Mercedes-AMG GT3 Evo for Steven Aghakhani and Jacob Eidson, while GRT Grasser Racing Team also makes its return with a single Lamborghini Huracan GT3 Evo for Misha Goikhberg and Franck Perera.
The six-car DPi field has remained unchanged compared to the previous round at Laguna Seca.
In GTLM, Mathieu Jaminet replaces Matt Campbell in the #79 WeatherTech Racing Porsche 911 RSR-19, partnering Cooper MacNeil.