IMSA has released Balance of Performance adjustments across all four classes ahead of the Sahlen’s Six Hours at the Glen, the next round of the TUDOR United SportsCar Championship season.

Three adjustments have been issued in the Prototype class.

The Riley-Ford has been given a 0.3 mm air restrictor increase, to 33.5 mm, while the Ligier JS P2 Honda has been given a 0.4 mm air restrictor increase, to 32.9 mm.

Additionally, the DeltaWing DWC13 coupe has had its refueling restrictor increased by 5 mm to 29.0 mm.

The Prototype Challenge Oreca FLM09 has been given a 5 mm fuel tank capacity increase to 85 liters, which will increase fuel stints for the second prototype category.

Corvette is the lone GT Le Mans car that has been given an adjustment. The Corvette C7.R has been given a 10 kg minimum weight break, down to 1,220 kg, and also a 0.3 mm air restrictor increase, to 30.1 mm.

In GT Daytona, the BMW Z4 GT3 and Ferrari 458 Italia GTE have been given 20 and 25 kg minimum weight breaks, respectively, to 1,240 and 1,295 kgs.

Additionally, the Ferrari has also been given a 100 max rpm boost to 8,400.

The entry list for the June 28 race, also the third round of the Tequila Patron North American Endurance Cup season, hasn’t come out yet but should be out next week.