The FIA has made additional Balance of Performance adjustments to GTE-Pro class machinery ahead of next weekend’s 24 Hours of Le Mans, with changes to four of the five cars in the factory driven class.

Outlined in a bulletin issued on Thursday, the latest change sees the Le Mans Test Day pace-setting Corvette C7.R slowed, with a 0.3 mm air restrictor reduction.

The Porsche 911 RSR, meanwhile, has been hit with a 5kg minimum weight increase, with the Ford GT receiving a further 5kg weight reduction, on top of its 20kg break it received prior to the test.

Aston Martin’s 2016-spec Vantage GTE has been given the biggest adjustments, in the form of a 10kg weight reduction and 0.2 mm smaller air restrictor.

Fuel capacity levels have also been adjusted across the class, with the Aston now eligible to carry 102 liters, compared to 98 liters for the Ford, 95 for Porsche, 93 for Corvette and 88 for the Ferrari 488 GTE car.

Per the revised BoP, the Aston must also run “Aero Kit B.”

No changes have been made to GTE-Am, other than a refueling restrictor increase for the Porsche.

The changes are only in effect for Le Mans, with the previous BoP table set to serve as the base for the remainder of the FIA World Endurance Championship season.