LS3 430HP Long Block

LS3 LONG BLOCK

Build it your way with proven LS performance.

Chevrolet Performance LS long blocks deliver the essential power foundation of a complete crate engine at a lower cost—giving builders the freedom to complete the assembly with their own components and style.

The LS3 long block arrives ready for customization, supplied without the intake manifold, coil packs, water pump, exhaust manifolds, or other accessories—ideal for those looking to tailor their setup for a specific performance or application.

TECH SPECS

Part Numbers: 19420382 / 19432422 / 19434644 / 19435106
Engine Type: LS-Series Gen IV Small-Block V-8
Displacement: 376 cu in (6.2L)
Bore x Stroke: 4.065 x 3.622 in (103.25 x 92 mm)
Block (P/N 12623967): Cast aluminum with 6-bolt, cross-bolted main caps
Crankshaft (P/N 12597569): Nodular iron
Connecting Rods (P/N 12649190): Powdered metal
Pistons (P/N 19207287): Hypereutectic aluminum
Camshaft Type (P/N 12623063): Hydraulic roller
Valve Lift: 0.551 in intake / 0.522 in exhaust
Camshaft Duration (@.050 in): 204° intake / 211° exhaust
Cylinder Heads (P/N 12629063): Aluminum L92-style ports, as-cast, 68cc chambers
Valve Size: 2.165 in intake / 1.590 in exhaust
Compression Ratio: 10.7:1
Rocker Arms (P/N 12669995 – Intake / 12669993 – Exhaust): Investment-cast, roller trunnion
Rocker Arm Ratio: 1.7:1
Recommended Fuel: Premium pump
Maximum Recommended RPM: 6,600
Reluctor Wheel: 58X
Balanced: Internal

INSTALLATION NOTES

• Assembly does not include electronics, intake manifold, fuel system, or ignition components

• Comes equipped with a Chevy F-Body wet sump oil pan

• Intended for pre-1976 street vehicles or off-road applications

• Not designed for marine use