Industrial Injection L5P Duramax Stock Long Block Engine
Restore dependable performance to your 2017–2023 Chevrolet Silverado or GMC Sierra equipped with the 6.6L L5P Duramax using an Industrial Injection Stock Long Block Engine. Built to meet or exceed OE specifications, this remanufactured long block combines precision machining, quality components, and professional engine assembly for daily driving, towing, and demanding work applications.
Every Industrial Injection Stock Long Block features a balanced and blueprinted rotating assembly, Industrial Injection X Series pistons, a keyed crankshaft and camshaft, and professionally reconditioned cylinder heads. Each engine undergoes simulation testing and quality inspections to help ensure dependable operation and long-term reliability.
Engine Features
- Remanufactured 6.6L L5P Duramax long block
- Designed to meet or exceed OE specifications
- Sim tested short block
- Balanced and blueprinted rotating assembly
- Industrial Injection X Series pistons
- Balanced and keyed Duramax crankshaft
- Includes stock harmonic damper and stock flex plate
- Balanced connecting rods
- Keyed camshaft
- Pinned oil pump
- Stock oil pickup tube
- Stock oil pan
- Built for long-term reliability and durability
Cylinder Head Features
- Reconditioned, milled, and surfaced cylinder heads
- High-strength alloy, heat-treated iron-based valve guides
- Diamond honed valve guides
- Premium nickel-based, non-magnetic valve seat inserts
- New unshrouded valves
- Multi-angle valve job
- New valve springs installed
- Duramax OEM head gaskets
- Stock head bolts installed
Stock Long Block Construction
The Industrial Injection L5P Stock Long Block is professionally machined and assembled to provide a reliable replacement engine foundation.
The balanced and blueprinted rotating assembly incorporates Industrial Injection X Series pistons, a balanced and keyed OEM Duramax crankshaft, and balanced connecting rods. A keyed camshaft and pinned oil pump provide additional mechanical security within the engine assembly.
The cylinder heads are reconditioned, milled, and surfaced, with upgraded valve guides and premium valve seat inserts. New unshrouded valves, a multi-angle valve job, and new valve springs complete the cylinder head assemblies.
Each engine undergoes simulation testing and quality inspections before leaving our facility.
What's Included
- Assembled 6.6L L5P Duramax long block
- Balanced and blueprinted rotating assembly
- Industrial Injection X Series pistons
- Balanced and keyed OEM Duramax crankshaft
- Balanced connecting rods
- Keyed Duramax camshaft
- Pinned oil pump
- Stock harmonic damper
- Stock flex plate
- Stock oil pickup tube
- Stock oil pan
- Reconditioned and assembled cylinder heads
- New valves and valve springs
- Duramax OEM head gaskets
- Stock head bolts
What's Not Included
- Rocker arms and pushrods
- Fuel injectors and external fuel system components
- Turbocharger and associated components
- Intake and exhaust manifolds
- Oil cooler
- Water pump
- External engine accessories
- Break-in oil and installation fluids
Additional components may be required to complete installation depending on the vehicle configuration and condition of the original engine.
Recommended Components to Inspect Before Installation
When replacing or rebuilding your L5P Duramax engine, the condition of supporting components is critical to the reliability of the completed installation. A failure in the original engine may leave contamination or damage in components that will be reused.
Industrial Injection recommends inspecting the following components before installing your rebuilt long block:
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Oil Cooler: Inspect for metal debris, contamination, or internal damage. Replacement may be necessary following a bearing or internal engine failure.
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Fuel Injectors: Have injectors tested and inspected for proper operation before reinstalling them. Injector problems can contribute to piston damage and other engine failures.
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Turbocharger: Inspect for excessive shaft play, oil leaks, wheel damage, and contamination. Any turbocharger problems should be corrected before installation.
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Water Pump: Inspect for leaks, bearing wear, and proper operation. Replace the water pump if its condition is questionable.
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Fuel System: Inspect fuel lines, filters, and fuel system components for contamination or damage. Address any existing fuel delivery problems before starting the rebuilt engine.
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Cooling System: Inspect the radiator, hoses, thermostat, and related components for restrictions, leaks, or contamination. Correct any cooling system problems that may have contributed to the original engine failure.
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Intake and Charge Air System: Inspect the intake piping, intercooler, and charge air connections for debris, oil accumulation, and damage that could affect the replacement engine.
Important: Always identify and correct the cause of the original engine failure before installing your rebuilt long block. Reusing damaged or contaminated components can lead to repeat engine failure and may affect warranty coverage.
Vehicle Fitment
Designed for the following vehicles equipped with the 6.6L L5P Duramax diesel engine:
- 2017–2023 Chevrolet Silverado 2500HD
- 2017–2023 Chevrolet Silverado 3500HD
- 2017–2023 GMC Sierra 2500HD
- 2017–2023 GMC Sierra 3500HD
Fitment Note: Engine configurations can vary by model year. Verify vehicle and engine information with Industrial Injection before ordering.
Why Choose Industrial Injection?
Industrial Injection has specialized in diesel components and engine solutions since 1985. Our engine-building program combines experienced technicians, precision machining, quality components, and careful assembly processes.
From stock replacements to performance engine builds, our team understands the requirements of diesel engines used for towing, work, and everyday driving.
Warranty Information
This engine is backed by Industrial Injection's 2-Year Unlimited Mileage Warranty, subject to the applicable engine warranty terms and conditions.
Proper installation and engine break-in are essential. Industrial Injection's break-in instructions require Driven Racing Oil (Joe Gibbs) 15W-50 Break-In Oil during the initial 300–500 miles, followed by an oil and filter change. Break-in oil is not included with the engine.
Follow all current Industrial Injection engine break-in and warranty requirements supplied with your engine.
Questions About Your L5P Duramax Engine?
Our engine specialists can help confirm vehicle compatibility, explain the Stock Long Block construction, and review the components needed to complete your engine installation.
Call Industrial Injection at 800-955-0476 for assistance.
