4LT GS Roadster
The reasoning behind that decision now seems solid, if the latest scuttlebutt is to be believed. Those rumors hold that a Stingray-based ZR1 model will bow early next year, armed with a supercharged version of the LT1 dubbed--you guessed it--the LT5.
New Corvette ZR1 Engine to Receive LT5 Designation? - Vette Magazine
