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The Most Powerful Crate Engine Ever Offered by GM

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LSX454 Corvette Engine

The LSX 454 is the most powerful crate engine Chevrolet has ever built, at 750 horsepower.

Photo courtesy of GM

What is this engine?:

The LSX454R (GM Performance Parts part number 19257880)is a 720-horsepower drag racing engine that is the most powerful small-block V-8 engine ever engineered by General Motors and offered for public sale.

The LSX454R is officially rated at 720 horsepower and 720 pound-feet of torque, with a very strong, all-forged rotating assembly (crankshaft, connecting rods, and pistons) and an optimized high-RPM airflow developed by engineers at GM Performance Parts.

The LSX454R is specially designed for the high-RPM demands of drag racing. It is a high-compression, solid-roller combination that uses the new LSX DR cylinder heads (GMPP part number 19166979). The 11-degree, six-bolt aluminum heads feature raised ports that provide tremendous airflow. They are matched on the engine with an exclusive, all-new high-rise open-plenum intake manifold and a Holley 1,150-cfm Dominator carburetor. You can also add power through the use of Nitrous Oxide or forced induction.

How is a crate engine different?:

A "crate engine" is sold separately from any car. Usually, these engines are the same as stock, and they are used to replace damaged engines. They're called "crate" because they come in a crate, or strapped to a shipping pallet.

In the case of the LSX454R, the engine is intended by GM for drag racing purposes. It is designed to produce its power at wide open throttle and high-RPM, rather than under normal street driving conditions.

You could still theoretically put this engine into a street car, but it might be difficult to drive it smoothly. The engine requires 110 octane fuel, just for starters.

What does the LDX454R cost?:

GM has not yet announced pricing on the LSX454R, but the 620-horsepower LSX454 was priced at $11,625 in 2010.

LSX454R Technical Specifications:

Bore: 4.185”
Stroke: 4.125”
Cubic inches: 454
Compression ratio: 13.1:1

Heads:
Drag race cylinder heads (6 bolt LSX aluminum) (bare head part number 19166979)

Flow:
Intake: 435 CFM at 0.800” lift at 28” water pressure
Exhaust: 252 CFM at 0.800” lift at 28” water pressure

Valves:
One piece stainless steel
Intake: 2.25” X 6.350” with 50 degree seat
Exhaust: 1.625” X 6.350” with 50 degree seat

Combustion chamber:
50 cc fully CNC’ed

Runners:
Fully CNC intake 313 cc and CNC 116 cc exhaust runners

Rocker arms:
Shaft mounted rocker arms with needle bearing fulcrum and tip
1.9:1 rocker ratio (part number 19201808)

Lifters:
Tie bar style mechanical roller lifters

Cam shaft:
Hard ground steel mechanical roller camshaft
Intake/exhaust lift: 0.738”
Duration at 0.050” lift: 250 degrees intake, 270 degrees exhaust
Lobe separation angle: 108

Pistons:
Forged 4032 aluminum with skirt coating 4.180” diameter with 0.866” steel wrist Pin. (part number 19166958, includes rings and wrist pin)

Ring pack:
Top ring: steel with plasma face, 1.2mm
Second ring: cast iron, 1.2mm
Oil ring: 11 lb, 2.0 mm

Crankshaft:
Forged 4340 steel 2.560” main journals, 2.100” connecting rod journal, uses 8 bolt flexplate/flywheel attachment (part number 19244018)

Rods:
Forged 4340 steel I-beam, 6.000” center to center, 2.100” big end, 0.866” wrist pin (part number 19166964)

Bearings:
Mains - Clevite MS-2199H, Rods - Clevite CB-663H
Harmonic Balancer: ATI –SFI approved

Block:
LSX cast iron with 6 bolt cylinder head attachment (part number 19244057)

Intake manifold:
Large plenum aluminum with 4500 series carburetor flange, cast in bosses for dual stage nitrous oxide (part number 19257851)

Carburetor:
4500 series Holley 1150 CFM

Fuel:
Race fuel (110 octane minimum)

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