Both the Chevrolet Corvette Z06 GT3.R and Callaway Corvette C7 GT3-R have been hit with weight increases ahead of this afternoon’s Suzuka 1000km.

Confirmed in a revised Balance of Performance table released on Sunday morning by SRO Motorsports Group, the factory-built Corvettes have been handed a 20kg increase, while the previous C7 generation Callaway model gets a 10kg increase.

It came after Nicky Catsburg, in the No. 2 Johor Motorsports JMR Corvette, set the outright fastest lap in qualifying, but will start ninth due to the combined three-driver average used to determine the grid.

The Mercedes-AMG GT3 Evo, meanwhile, has been given a 10kg weight break ahead of the penultimate round of the Intercontinental GT Challenge season, with the Nissan GT-R NISMO GT3 able to now run 5kg lighter than its specification at the start of the weekend.
Porsche’s Type-992 911 GT3 R has undergone a 5kg weight increase but countered with a 1.5mm larger restrictor that will result in a power increase.

The pole-sitting BMW M4 GT3 EVO has also received a slight power increase at mid-to-high RPM levels, while the Ferrari 296 GT3 receives a minor increase at the low-end but slight decrease at the high-end range.

The Suzuka 1000km gets underway at 12:50 p.m. local time (Saturday, 11:50 p.m. EST) with live coverage on SRO’s GT World YouTube channel.