WARNING: This page is about a different car, the 2003 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: View Of Engine (LS1/LS6)
Courtesy of GENERAL MOTORS CORP.
The 5.7 Liter V 8 engine is identified as RPO LS1 (VIN G) and RPO LS6 (VIN S).