Was in Detroit this weekend for the GP. Was part of the Cadillac corral. While there I was able to get a little one on one face time with the chief engineer of the V division and asked him about this rumor. He told me emphatically that a V-8 in the ATS-V was NEVER going to happen. He stated that the car was designed and setup specifically for the TT V6. He said that weight and balance were huge considerations. When I asked about the LS7 weighing less than the V6, he said it does...until you add all of the fluids, including the 11 quarts of oil that the LS7 requires. I still want to drive one, but so far I'm impressed with the looks of the car.