2004 Pontiac GTO 5.7L LS1 Engine – Complete Aluminum V8 & Tremec T56 6-Speed Manual
For custom car creators, retro muscle car builders, and professional restomod shops, selecting a complete 2004 Pontiac GTO 5.7L LS1 Engine package provides an exceptional opportunity to acquire a legendary, high-revving drivetrain featuring a highly coveted manual setup. Sourced directly from an operational vehicle core showing only 74,000 verified original miles, this comprehensive powertrain features the high-performance Gen III aluminum 346ci small block engine natively paired alongside its original, heavy-duty Tremec T56 six-speed manual gearbox. Choosing a complete standalone 2004 Pontiac GTO 5.7L LS1 Engine pullout assembly streamlines your vehicle conversion project, delivering the entire lightweight mechanical block, manual transmission, and electronic management core together to eliminate the immense hidden costs of tracking down individual accessory brackets, high-end intake induction systems, and compatible wiring components separately.https://perlicanparts.org/auto-parts-store-about/
INTAKE | NICK WILLIAMS 92MM THROTTLE BODY
What is included:
Complete 2004 GTO LS1 5.7L 346ci Engine w/ 74k miles (Intake to Oil Pan) ECM Computer Tremec T56 6-Speed Transmission Complete Front Accessories w/ Brackets and Bolts Starter MAF (Mass Air Flow) Sensor All Sensors on Engine
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Technical Specifications of the Upgraded 2004 Pontiac GTO 5.7L LS1 Engine
When planning an upgrade, manual sports car swap, or structural vehicle restoration centered around a 2004 Pontiac GTO 5.7L LS1 Engine for a classic car retrofit or an OEM vehicle replacement, tracking precise mechanical factory specifications is critical for managing fuel delivery lines and physical engine bay clearances.
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Engine Core Construction: Lightweight cast-aluminum cylinder block featuring structural cross-bolted six-bolt main bearing caps and high-flowing 241 casting cylinder heads
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Premium Aftermarket Induction: Equipped with an upgraded FAST 92mm composite intake manifold and a matching Nick Williams 92mm high-flow mechanical throttle body
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Transmission Integration: Authentic Tremec T56 6-speed manual transmission featuring a robust double-overdrive gear layout for high-performance shifting
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Oiling System Configuration: True car-spec configuration featuring a GTO-specific front-sump oil pan architecture optimized for low-slung passenger platforms
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Factory Engine Displacement: 5.7 Liters (346 cubic inches) of premium all-aluminum V8 performance
To cross-reference specific block casting marks, internal oiling routing schematics, or cylinder head airflow charts for high-performance General Motors or Ford sports car engine architectures, you can check out the comprehensive public databases on LSX Magazine and Tech Reference Indexes.
What is Included in This Complete Drivetrain Turn-Key Package?
This 2004 Pontiac GTO 5.7L LS1 Engine pullout assembly is delivered as an ultra-complete mechanical package, preserving the critical factory electronics, manual shifting components, and high-performance induction gear that typical salvage yards slice through or damage during hasty extraction.
Electronics, Loom, & Control Architecture
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Complete factory engine wiring harness with all primary fuel injector, individual coil pack, and manual transmission position clips intact.
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Original matching Engine Control Module (ECM) computer pre-loaded with factory 2004 GTO manual performance management parameters.
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Original matching high-fidelity Mass Air Flow (MAF) sensor to guarantee clean air-to-fuel ratio signaling to the central computer.
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Full set of all vital engine monitoring sensors pre-installed (including oil pressure feedback, crankshaft positioning, cam, and temperature sensors).
Mechanical Core Components & Aftermarket Induction Line
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Premium FAST 92mm structural composite intake manifold assembly, matching fuel rails, fuel injectors, and a Nick Williams 92mm performance throttle body.
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Aluminum 241 cylinder heads with complete internal overhead valvetrain, factory performance camshaft, pistons, connecting rods, and crankshaft.
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Authentic Tremec T56 6-speed manual transmission complete with its original manual shifter linkage assembly, clutch pressure plate, and structural flywheel.
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Full front accessory drive array complete with all factory structural car brackets, hardware bolts, alternator, power steering pump, and A/C compressor.
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High-torque starter motor, original factory cast iron exhaust manifolds, and a factory structural GTO front-sump oil pan.
Why the 2004 Pontiac GTO 5.7L LS1 Engine T56 Setup is the Ultimate Swap Choice
Performance enthusiasts and vintage hot-rod shops actively prioritize finding a genuine 2004 Pontiac GTO 5.7L LS1 Engine package over standard truck platforms because it delivers a monumental leap in weight-saving efficiency and high-revving manual sports car dynamics. The 2004 GTO version represents the absolute peak refinement of the Gen III aluminum-block family, introducing stronger internal block casting provisions. Because it utilizes a lightweight aluminum alloy block structure, it shaves nearly 100 pounds off the front nose of your vehicle compared to heavy cast-iron options, drastically improving handling metrics and chassis weight distribution.
Additionally, because the 2004 Pontiac GTO 5.7L LS1 Engine in this package includes a factory-mated Tremec T56 6-speed manual transmission, it commands massive market premium demand for pro-touring builds. The T56 gearbox features dual overdrive gears, allowing your classic custom vehicle to cruise comfortably at low engine speeds on open highways while maintaining crisp, mechanical shift engagement around the track. This specific pullout has been further enhanced with a premium FAST 92mm intake manifold and Nick Williams 92mm throttle body, eliminating the restrictive factory intake track to unlock substantial horsepower gains straight out of the box. Watch a detailed, running walkthrough of this exact package live by checking out our Walkaround Video on Instagram.
Freight Shipping Logistics and Universal Drivetrain Compatibility
This universal 2004 Pontiac GTO 5.7L LS1 Engine drivetrain package serves as a direct factory replacement for 2004 Pontiac GTO models, and stands as an exceptional premium engine swap foundation for vintage muscle cars, classic pro-touring trucks, or custom street rods.
We anchor this entire heavy-duty V8 package onto an industrial wooden shipping pallet, wrapping the aluminum block, Tremec T56 manual transmission, and premium induction accessories in protective industrial shrink-wrap to isolate components from road vibrations during freight transit. All motor oils, transmission fluids, and cooling system residues are completely extracted prior to shipment to fully comply with nationwide highway freight transport protocols. To explore complementary conversion gear or alternative mounting setups, make sure to browse our General LS Engine Swaps Inventory or check out our catalog of Tested Automatic Transmissions to match alternative mounting brackets or gear layouts.
Frequently Asked Questions (FAQs)
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Does this engine require a drive-by-wire or drive-by-cable throttle setup? The 2004 GTO platform features a drive-by-cable electronic configuration; the included Nick Williams 92mm performance throttle body runs a highly reliable physical mechanical linkage for crisp pedal response.
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What oil pan modifications are required to swap this engine into an older car? The GTO features a unique front-sump oil pan layout; depending on your specific chassis crossmember (such as an older Camaro or Nova), you may need to swap this out for a retrofitted rear-sump or low-profile oil pan.
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Where can I buy a reliable 2004 Pontiac GTO 5.7L LS1 Engine package online? Our fully certified, visually inspected engine pullouts provide professional car and truck builders with an honest, completely documented, and dependable performance foundation.
Disclaimer: This pre-owned automotive powertrain package is sold intended for professional vehicle restoration, OEM replacement, or private custom engine swap applications. Professional installation, fresh fluid lines, and complete electronic calibrations are highly recommended to maximize field safety and component durability.
