LSX Crate Motors - GM Performance Parts

New GM Performance Parts 454... 

   

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New GM Performance Parts 454 LSX crate motor puts out 620 hp on pump gas. That's as much as GMPP's hydraulic roller 572-ci big-block crate motor.

GM Performance Parts has just released the first pair of crate engines based on the LSX Bowtie block: the LSX376 and LSX454. The LSX Bowtie block is the foundation of GMPP's LSX line, and is designed to support high horsepower LS engine combinations (read: 2,000 hp) that are suitable for the street, or racing applications. The new crate engines leverage the expertise of GM's LS engine program, but take it to the next level with race-caliber components. They join GMPP's production-based LS crate engines and engine controllers to comprise the industry's most complete lineup of LS engines, components and systems.

LSX376
The LSX376 (part number 19171049) is an affordable performer that combines the economical and strong LSX block with the production LS3 engine's high-flow, L92-style cylinder heads and camshaft. Unique, forged-aluminum LSX pistons also are part of the assembly. Unique LSX376-logo valve covers distinguish the new crate engine. When fitted with a production LS3 intake manifold and injection system (not included), the LSX376 is capable of producing 450 horsepower and 430 lb.-ft. of torque. It can also be fitted with a carbureted induction system that can be tuned for greater power. The manifold and carburetor are available from GMPP.

LSX454
The new LSX454 crate engine (part number 19166972) uses the LSX block, along with an all-forged rotating assembly, and a pair of GMPP's new deep-breathing LSX six-bolt cylinder heads. It's topped with a high-rise intake manifold and four-barrel carburetor, so it's a more complete turnkey assembly than the LSX376. The new LSX six-bolt cylinder heads are based on the race-derived LS7 heads from the Corvette Z06. They enable tremendous low-end torque and high-rpm power. The LSX454 is rated at 620 horsepower and 600 lb.-ft. of torque. The LSX454 is delivered in Deluxe form, so it includes everything from the carburetor to the water pump. It also comes dressed with new orange, powder-coated valve covers with "LSX454" logos engraved and painted black.

LSX376 SPECIFICATIONS:
Part number: 19171049
Engine type: LSX Series Gen IV small-block V-8
Displacement (cu in / L): 376 / 6.2L
Bore x stroke (in / mm): 4.06 x 3.62 / 103.25 x 92
Block (P/N 19166454): LSX cast iron with six-bolt, cross-bolted main caps
Crankshaft: nodular iron
Connecting rods: powdered metal
Pistons: forged aluminum
Camshaft type: hydraulic roller
Valve lift (in): 0.551 intake / 0.522 exhaust
Duration (deg @ 0.050 in): 204 intake / 211 exhaust
Cylinder heads (P/N 12598594): LS3 rectangular port; as cast with 68cc chambers
Valve size (in): 2.16 intake / 1.59 exhaust
Compression ratio: 10.7:1
Rocker arms: investment cast, roller trunnion
Rocker arm ratio: 1.7:1
Recommended ruel: 92 octane
Reluctor wheel: 58X
Balanced: internal

LSX454 SPECIFICATIONS:
Part number: 19166972
Engine type: LSX Series Gen IV small-block V-8
Displacement (cu in / L): 454 / 7.4
Bore x stroke (in / mm): 4.185 x 4.125 / 164 x 162
Block (P/N 19166454): LSX cast iron with 6-bolt, cross-bolted main caps
Crankshaft: 4340 forged steel
Connecting rods: 4340 forged steel
Pistons: Forged aluminum
Camshaft type: Hydraulic roller
Valve lift (in): 0.635 intake / 0.635 exhaust
Duration (deg @ 0.050 in): 236 intake / 240 exhaust
Cylinder feads (P/N 12598594): LSX454 rectangular port; with 70cc chambers
Valve size (in): 2.20 intake / 1.61 exhaust
Compression ratio: 11:1
Rocker arms: investment cast, roller trunnion
Rocker Arm Ratio: 1.8:1
Recommended Fuel: 92 octane
Reluctor wheel: 58X
Balanced: internal

The bargain here is GMPP's...        read full caption The bargain here is GMPP's 376-ci (6L) LSX partial long-block. It comes without the top end induction-add your own EFI or carb set-up, or add GMPP's intake. With the LS3's top end, power is around 450 hp.

New six-bolt LSX cylinder...        read full caption New six-bolt LSX cylinder heads employ NASCAR flow technology to boost flow capacity high enough to support over 600hp in box-stock form-well into aftermarket big-block territory.

A selection of new LSX intake...        read full caption A selection of new LSX intake manifolds is on hand to support different power levels. Note the bosses, which can support fuel injectors and nitrous jets.