The 4.8, 5.3, and 6.0 Liter V8 Engines
The 4.8, 5.3, and 6.0 liter V8 engines are identified as RPO LR4 VIN V (4.8L), RPO LM7 VIN T (5.3L), RPO L33 VIN B (5.3L), RPO L59 VIN Z (5.3L), RPO LQ4 VIN U (6.0L), and RPO LQ9 VIN N (6.0L).
Courtesy of GENERAL MOTORS CORP.