Description
Unleash Race-Bred Power with the LS427 from Chevrolet Performance
Derived from the legendary LS7 and developed with Corvette Z06 heritage, the Chevrolet Performance LS427 Crate Engine (P/N 19421004) delivers an impressive 570 horsepower and 540 lb-ft of torque. This naturally aspirated 7.0L beast is built for serious performance, whether you’re building a race car, street machine, or Pro-Touring monster.
Built with all-forged internals and high-flow CNC-ported cylinder heads, the LS427 is engineered to handle aggressive driving and track abuse—while maintaining the reliability that LS engines are famous for.
Key Features & Benefits
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Displacement: 7.0L / 427 CID
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Horsepower: 570 HP @ 6,200 RPM
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Torque: 540 lb-ft @ 4,800 RPM
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Compression Ratio: 11.0:1
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Block: LS7 cast aluminum with 6-bolt, cross-bolted main caps
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Crankshaft: Forged steel, 4.000″ stroke
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Rods: Forged powdered metal
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Pistons: Forged aluminum
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Cylinder Heads: CNC-ported LS7 aluminum heads with 2.20”/1.61” valves
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Camshaft: Hydraulic roller, .591/.591 lift, 227°/242° duration @ .050
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Rocker Arms: 1.8:1 ratio
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Max RPM: 7,000+
What’s Included
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Fully assembled long block
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LS7 CNC aluminum heads
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Hydraulic roller camshaft
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LS7 forged rotating assembly
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Timing cover, valve covers, and valley cover
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Harmonic balancer
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Oil pan (wet sump)
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Intake manifold, throttle body, fuel system, ECU & wiring harness not included
Ideal For
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Pro-touring builds
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Road racing and autocross
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High-performance street cars
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Engine swaps (Camaro, Corvette, Chevelle, Nova, etc.)
Why Choose the LS427?
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Factory-engineered reliability with race-grade power
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Perfect blend of torque, RPM range, and street manners
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LS-family compatibility for easy swaps and aftermarket support
Specs at a Glance
| Specification | Detail |
|---|---|
| Displacement | 7.0L (427 CID) |
| Horsepower | 570 HP @ 6,200 RPM |
| Torque | 540 lb-ft @ 4,800 RPM |
| Compression Ratio | 11.0:1 |
| Block Material | Aluminum |
| Head Material | Aluminum (CNC-Ported) |
| Camshaft Type | Hydraulic Roller |
| Crankshaft | Forged Steel |
| Fuel Type | Premium Pump Gas (91+ Octane) |
| Redline | Over 7,000 RPM |
| Balance Type | Internal |
Pro Tip:
Pair the LS427 with a Holley EFI system and a T56 Magnum for an unbeatable street-and-strip combo. Explore compatible accessories in our LS Engine Parts Collection.
Related Links
Chevrolet Performance Quality – Built to Win
Backed by decades of GM motorsports engineering, this engine is built by Chevrolet Performance and is ideal for demanding enthusiasts who don’t settle for less than 500+ horsepower—right out of the box.
LS427 vs. LS3 vs. LS7 vs. LT1 Crate Engine Comparison
| Feature / Engine | LS427 (19421004) | LS3 (19419865) | LS7 (19329246) | LT1 (19431955) |
|---|---|---|---|---|
| Displacement | 7.0L / 427 CID | 6.2L / 376 CID | 7.0L / 427 CID | 6.2L / 376 CID |
| Horsepower | 570 HP @ 6,200 RPM | 430 HP @ 5,900 RPM | 505 HP @ 6,300 RPM | 460 HP @ 6,000 RPM |
| Torque | 540 lb-ft @ 4,800 RPM | 425 lb-ft @ 4,600 RPM | 470 lb-ft @ 4,800 RPM | 465 lb-ft @ 4,600 RPM |
| Compression Ratio | 11.0:1 | 10.7:1 | 11.0:1 | 11.5:1 |
| Block Material | Aluminum | Aluminum | Aluminum | Aluminum |
| Head Type | CNC-Ported LS7 Aluminum | LS3 Aluminum | CNC-Ported LS7 Aluminum | LT1 Aluminum w/ Direct Injection |
| Camshaft | .591/.591 Lift, 227°/242° @ .050 | .551/.522 Lift, 204°/211° @ .050 | .591/.591 Lift, 211°/230° @ .050 | Variable Valve Timing Camshaft |
| Fuel Delivery | Not Included (Add aftermarket EFI) | EFI (included) | EFI (included) | Direct Injection (included) |
| Redline | 7,000+ RPM | 6,600 RPM | 7,000+ RPM | 6,600 RPM |
| Balance | Internal | Internal | Internal | Internal |
| Street-Ready | Yes (with EFI add-on) | Yes | Yes | Yes |
| Best For | Racing / Pro-Touring / Strip Builds | Budget-Friendly Street Builds | Street/Track Performance Builds | Modern Restomods / Daily-Driveable Builds |
Which One Should You Choose?
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✅ LS427 – For high-horsepower street or race builds that need torque and track reliability without forced induction.
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✅ LS3 – Great all-around value for restomods, hot rods, and weekend cruisers.
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✅ LS7 – Legendary performance with better high-RPM breathing, ideal for track day enthusiasts.
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✅ LT1 – For modern drivability with direct injection and variable valve timing—great for newer vehicles and fuel-conscious builds.
