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.
LSX376The 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.
LSX454The 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: 19171049Engine type: LSX Series Gen IV small-block V-8Displacement (cu in / L): 376 / 6.2LBore 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 capsCrankshaft: nodular ironConnecting rods: powdered metalPistons: forged aluminumCamshaft type: hydraulic rollerValve lift (in): 0.551 intake / 0.522 exhaustDuration (deg @ 0.050 in): 204 intake / 211 exhaustCylinder heads (P/N 12598594): LS3 rectangular port; as cast with 68cc chambersValve size (in): 2.16 intake / 1.59 exhaustCompression ratio: 10.7:1Rocker arms: investment cast, roller trunnionRocker arm ratio: 1.7:1Recommended ruel: 92 octaneReluctor wheel: 58XBalanced: internal
LSX454 SPECIFICATIONS:Part number: 19166972Engine type: LSX Series Gen IV small-block V-8Displacement (cu in / L): 454 / 7.4Bore x stroke (in / mm): 4.185 x 4.125 / 164 x 162Block (P/N 19166454): LSX cast iron with 6-bolt, cross-bolted main capsCrankshaft: 4340 forged steelConnecting rods: 4340 forged steelPistons: Forged aluminumCamshaft type: Hydraulic rollerValve lift (in): 0.635 intake / 0.635 exhaustDuration (deg @ 0.050 in): 236 intake / 240 exhaustCylinder feads (P/N 12598594): LSX454 rectangular port; with 70cc chambersValve size (in): 2.20 intake / 1.61 exhaustCompression ratio: 11:1Rocker arms: investment cast, roller trunnionRocker Arm Ratio: 1.8:1Recommended Fuel: 92 octaneReluctor wheel: 58XBalanced: internal