Owner put his on a scale
C8 Z06 with Z07 :
3LZ equipped with the Carbon wheels
1/3 tank (~7 Gal) of gas: 3600 lbs.
After filling up full of fuel to the 18 Gal capacity, weighed again and got 3680 lbs.
This was with no driver inside
Printout of weighing shows front to rear weight ratio as 33/67 !
It's a heavy pig