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. With a carburetor and high-flow Chevrolet Performance intake manifold, the LSX454 is good for about 620 horsepower and 600 lb.-ft. of torque with a carburetor, or about 580 hp and 600 lb.-ft. with fuel injection.

Use 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 8-bolt crankshaft flange that may require an adapter for use with some transmissions.

lsx454 TECH SPECS
Part Number: 19355573
Engine Type: LSX-Series Gen IV Small Block V8
Displacement (cu in): 454 cu in (7.4L)
Bore x Stroke (in): 4.185 x 4.125 (106.3 x 104.8 mm)
Block (P/N 19260099): LSX Cast Iron with 6-Bolt, Cross Bolted Main Caps
Crankshaft (P/N 19244018): 4340 Forged Steel with 8-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” 70cc 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: 6,500
Reluctor Wheel: 58X
Balanced: Internal

INSTALLATION NOTES

• Assembly does not include any electronics
• Requires LS-7 pattern intake manifold
• Intended for pre-1976 street vehicles or any off-road vehicle
• Not intended for marine applications
• Requires LSX Ignition Controller P/N 19171130 when using a carburetor
• Requires the purchase and installation of an oil pan (see page 251) (dust shield installed for shipment)
• LSX 8-bolt crank flange
• Requires premium fuel

19260833 Installation Guide PDF

19260833 Warranty Detail PDF