With endurance racing back on the IMSA docket after a trio of sprint races, the Sahlen’s Six Hours of the Glen features a 56-car entry list swollen with IMSA Michelin Endurance Cup (IMEC) entries. That includes the return of Iron Lynx Lamborghini’s SC63 with Andrea Caldarelli and Matteo Cairoli handling driving duties, bringing the GTP field to 11.

The six-hour format on the 3.4-mile, 11-turn Watkins Glen International circuit allows pro teams in GTP and GTD PRO to choose to run three drivers, or only two. Most have opted to keep their two core drivers, although a few will bring in their endurance addition. That includes Whelen Cadillac Racing adding Tom Blomqvist to Pipo Derani and Jack Aitken, the IMEC leaders in GTP, and JDC-Miller MotorSports bringing back Phil Hanson.