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.
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