The budget performer of the LS family!
Chevrolet Performance engineers have developed the LS364/450 6.0L as avalue-driven foundation for 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, it features the high-lift LS6 camshaft and deep-breathing LS3 aluminum cylinder heads. It’s a strong combination that provides exceptional horsepower and a broad torque band. It is also fuel injection-capable, using production-based components offered in this catalog. Additionally, the LS364/450 is designed with the early-style 24X crankshaft and 1X camshaft sensors, enabling easy retro-fit installation in early LS-powered vehicles.
We offer the LS364/450 exclusively as a long-block assembly, without the induction system, ignition system or front-end accessory drive system, allowing builders to transfer components from their early LS-powered vehicle or complete a custom build with the components of their choice. An intake manifold that matches the LS3/L92-style rectangular intake ports is required.

TECH SPECS
*Part Number: 19434650
*Engine Type: Performance LQ9 long block
*Displacement (cu in): 364 cu in (6.0L)
*Bore x Stroke (in): 4.000 x 3.622 in (101.6 x 92 mm)
*Block: Cast iron with 6-bolt block,
*cross-bolted main caps
*Crankshaft: Nodular iron
*Connecting Rods: Powdered metal
*Pistons: Hypereutectic aluminum
*Camshaft Type (P/N 12565308): LS6 hydraulic roller
*Valve Lift (in): 0.550 intake / 0.550 exhaust
*Camshaft Duration (@.050 in): 204º intake / 218º exhaust
*Cylinder Heads: LS3 rectangular port; aluminum, as-cast with 68cc chambers

*Valve Size (in): 2.165 intake (hollow stem) 1.590 exhaust (solid stem)
*Compression Ratio: 10.3:1 (nominal)
*Rocker Arms: Investment-cast, roller bearing trunnion
*Rocker Arm Ratio: 1.7:1
*Recommended Fuel: Premium pump
*Maximum Recommended rpm: 6,800
*Reluctor Wheel: 24Xe
*Balanced: Internal

INSTALLATION NOTES
• Assembly does not include any electronics
• Engine is compatible with a vehicle’s existing Gen III controller, but tuning
is required
• Includes LQ9 oil pan
• Requires intake manifold matched to LS3- or L92-style rectangular intake ports
• LS3 or L96 production intake manifolds can be used, but require an aftermarket
adapter plate for use with early LS three-bolt throttle bodies
• Not intended for marine applications