Chevrolet Performance 19260833 7.4L LSX 454 Crate Engine

Brand: Chevrolet Performance

Part Number: 19260833


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LSX454 Crate Engine

627hp @ 6,300 rpm / 586 lb.-ft. @ 5,100 rpm


An LSX with Big-Block Power!

With the Chevrolet Performance LSX Bowtie small block crate motor, we’ve built a 21st century 454 with the latest technology. It’s lighter and more compact than an original Big Block 454 – while delivering Big Block output of 627 hp and 590 lb-ft – but requires no more space under the hood than a production LS engine.

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

Chevy Performance delivers the LSX454 crate engine without an intake manifold and other accessories. 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.


19260833 Chevrolet Crate Motor

LSX454 Tech Specs:
Part Number: 19260833
Engine Type: LSX-Series Gen IV Small Block V-8
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: Premium pump
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 (dust shield installed for shipment)
• LSX 8-bolt crank flange
• Requires premium fuel