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hp @6200 rpm

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, or about 580 hp and 600 lb-ft with fuel injection.

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.


Click on the slider to see the torque and power ratings change with rpm.*

*Approximate values shown.


Part Number:
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 (@.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:
Rocker Arms (P/N 12579615 int):
Investment-cast, roll trunnion
Rocker Arms (P/N 12579617 exh):
Investment-cast, roll trunnion
Rocker Arm Ratio:
Recommended Fuel:
92 octane
Maximum Recommended rpm:
Reluctor Wheel:


Already own one, but lost some of the paperwork? We’ve got you covered with downloads and links for some of the more important documents below. You’ll find everything from the vital data about your engine’s capabilities to how to install it into your build, even all of the warranty information should you need to make a claim. And don’t forget, the best way we can make sure to get you the latest information on your specific part is to tell us which one you have by registering your engine. No matter what stage of your build you’re in — from shopping for the right part to that part having turned in a few miles — we have the information you need.

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    • Assembly does not include any electronics
    • 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 eight-bolt crank flange
    • Requires premium fuel

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Download a catalog for a full listing of components and related parts.

SuperMatic 4L85-E 4-Speed Transmission
• P/N 19154550

LS7 Production Intake Manifold Assembly • P/N 12610435

LSX454 Engine Controller Kit • P/N 19244481 Manual
• P/N 19299840 Automatic

LSX-LS7 Standard Deck 4-bbl Manifold • P/N 19244033

LSX Ignition Controller • P/N 19171130

SuperMatic Torque Converter • P/N 19299807

  • 1 Performance MSRP The Manufacturer's Suggested Retail Price excludes tax, shipping and installation.

Destination Freight Charges

To allow you to do an accurate price comparison with prices featured on other Internet sites, GM provides Internet pricing both with and without the Destination Freight Charge (see prices including Destination Freight Charge below). To get full pricing details, go to our Build Your Own section.