IMSA has rescheduled the Six Hours of the Glen next year to take place seven days prior in order to avoid a clash with the 24 Hours of Spa endurance race.
The Six Hours of the Glen was originally announced last month for 30 June, and has now been set seven days prior on Sunday 23 June.
Circuit de Spa-Francorchamps will host the 100th anniversary of the 24 Hours of Spa endurance race, which is currently part of the GT World Challenge Europe series.
The Watkins Glen-hosted IMSA race will keep its place in the 2024 calendar as the sixth round of the season, and the third endurance race after the 24 Hours of Daytona, and the 12 Hours of Sebring.
IMSA President John Doonan said: “IMSA has elected to make this adjustment to our 2024 schedule for the benefit of many of our global automotive partners and drivers who not only compete in the IMSA WeatherTech SportsCar Championship, but also in many other prestigious 24-hour races.
“We were able to accommodate this change through a spirit of collaboration with our partners at NBC Sports and Watkins Glen International, and we are grateful to all involved for their cooperation.
“IMSA expects to return to its traditional and longstanding date on the last weekend of June in 2025 and beyond.”
The IMSA WeatherTech SportsCar Championship utilises GT3 cars, respectively as GTD (Grand Touring Daytona), across all races throughout next year’s season.
Many of the IMSA GTD and GTD Pro drivers will take part in the Spa 24 Hours, and this adjustment has avoided the clash between the two events.
There are still three World Endurance Championship and IMSA races which take place on the same weekends as one another.
First is the WEC 6 Hours of Imola (20 April) and the IMSA Long Beach 1-hour and 40-minute sprint race (21 April).
This is followed by the WEC 6 Hours of Spa-Francorchamps (11 May) and the IMSA Laguna Seca 2-hour and 40-minute sprint race (12 May), which features both GTD classes and the GTPs competing.
Finally, WEC’s 6 Hours of Sao Paulo return will clash with IMSA’s Chevrolet Grand Prix on 14 July, although this IMSA race will only utilise LMP2, GTD and GTD Pro classes, the former of which will be removed from the WEC package from next year.