While no one actually has details yet, we're 99.99% sure again that if this is the Z28, then there's an LSA under yonder hood. To refresh your memory, an LSA is the same engine that powers the very, very mighty Cadillac CTS-V. How mighty? 556 hp and 551 lb-ft of torquage. Not quite as brute as the ZR1's LS9 (638 hp, 604 lb-ft of torque), but then what is? Will the Chevy get every one of the Caddy's ponies? Most likely not quite. The Z28 will probably be slightly detuned so as to preserve some sort of outdated, century-old General Motors pecking order that no one outside of Detroit boardrooms has cared about in fifty years. We keep hearing "just" 550 hp. But again, maybe not.