Chev Performance LS364/450HP - Gen III 6.0L 24x Long Block LQ9 # 19434650Chev Performance LS364 450HP Gen III 6. 0L 24x Long Block LQ9 # 19434650 BUDGET PERFORMER BLENDS BEST OF LS ENGINE FAMILY Chevrolet Performance engineers have developed the LS364 450 as a value driven foundation for hot rod builders and enthusiasts looking to give their earlier LS powered vehicles a high performance shot in the arm. Starting with a strong, economical iron cylinder block and durable rotating assembly, the LS 6. 0L features the high