top of page


SKU: 19417357


Big-Block performance built from our LSX Small-Block


One of the most legendary engines in muscle-car history was the Chevy 454 Big-Block. With the LSX Bowtie block, Chevrolet Performance engineers were able to build a 21st century 454 with the latest technology — and it requires no more space under the hood than a production LS engine.

The LSX454 is filled with an all-forged, super-tough rotating assembly and features a pair of our new, deep-breathing LSX six-bolt cylinder heads. It also comes dressed with great-looking, orange powder-coated valve covers with engraved LSX454 logos.

We deliver the LSX454 without an intake manifold and other accessories. Use the LSX-LS7 single-plane carbureted intake manifold (P/N 19244033). The LSX454 valve covers do not include provisions for mounting ignition coil brackets.  Aftermarket or custom relocation brackets must be obtained. It also includes an eight-bolt crankshaft flange that may require an adapter for use with some transmissions.

  • Horsepower

    627 HP

  • Torque

    586 LB-FT

  • Tech Specs

    Engine Type: LSX-Series Gen-IV Small-Block V-8

    Displacement (cu. in.): 454 (7.4L)

    Bore x Stroke (in.): 4.185 x 4.125 (106.3 x 104.8 mm)

    Block (P/N 19244057): LSX cast-iron with six-bolt, cross-bolted main caps

    Crankshaft (P/N 19244018): 4340 forged steel with eight-bolt flange

    Connecting Rods (P/N 19166964): 4340 forged steel

    Pistons (P/N 19166958): Forged aluminum

    Camshaft Type (P/N 19166972): Hydraulic roller

    Valve Lift (in.): 0.648 intake / 0.648 exhaust

    Camshaft Duration (@0.050 in.): 236° intake / 246° exhaust

    Cylinder Heads (P/N 19201806): Aluminum LSX-LS7 port; with “as cast” 70-cc chambers

    Valve Size (in.): 2.200 titanium intake / 1.610 hollow, sodium-filled exhaust

    Compression Ratio: 11.0:1

    Rocker Arms (P/N 12579615 int): Investment-cast, roll trunnion

    Rocker Arms (P/N 12579617 exh): Investment-cast, roll trunnion

    Rocker Arm Ratio: 1.8:1

    Recommended Fuel: 92 octane

    Maximum Recommended rpm: 6500

    Reluctor Wheel: 58X

    Balanced: Internal

bottom of page