Industrial Injection L5P Duramax Stock Long Block Engine
Restore your 2017–2023 Chevrolet Silverado or GMC Sierra 2500HD/3500HD equipped with the 6.6L L5P Duramax using an Industrial Injection Stock Long Block Engine. Designed for customers who need a dependable engine rebuild for daily driving, towing, and work truck applications, this stock replacement long block provides an assembled engine foundation for returning your truck to service.
Industrial Injection has decades of diesel engine experience, combining professional machining, quality replacement components, and experienced engine assembly. Our stock long block program focuses on restoring factory-style engine operation without requiring a performance-focused build.
Key Features
- Stock replacement configuration for the 6.6L L5P Duramax
- Professionally machined and assembled engine
- Assembled short block and cylinder heads
- Cylinder heads assembled with valves and valve springs
- Engine components evaluated during the rebuilding process
- Designed for factory-style power and everyday operation
- Suitable for daily driving, towing, and work truck applications
- Repair & Return service for eligible L5P engines
Stock Long Block Construction
The Industrial Injection L5P Stock Long Block is built around the customer's existing engine. During the rebuilding process, the engine is inspected to determine the required machining, replacement components, and assembly work.
The completed long block includes the assembled lower engine and cylinder heads with valves and valve springs. Unlike a short block, the long block provides the upper cylinder head assemblies needed to complete the engine foundation.
Final machining operations, rotating assembly components, and included hardware are determined by the approved L5P build specifications.
What's Included
- Assembled 6.6L L5P Duramax engine block and rotating assembly
- Assembled cylinder heads
- Cylinder head valves and valve springs
- Internal components and machine work specified in the approved engine rebuild
Important: Oil pan, oil pump, pickup tube, harmonic damper, flex plate, fasteners, and other application-specific components should be confirmed against the final build sheet before ordering.
What's Not Included
The following components are not part of the standard Duramax long block assembly unless specifically included in your written quote:
- Rocker arms and pushrods
- Fuel injectors and fuel injection system components
- Turbocharger and associated components
- Intake and exhaust manifolds
- Engine accessories and external components
- Break-in oil and installation fluids
Additional installation components may be required depending on the application and condition of the original engine.
Vehicle Fitment
Intended for 2017–2023 GM trucks 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: Component configurations and engine specifications may vary by model year. Confirm your VIN, engine identification, and original engine configuration with Industrial Injection before ordering.
Repair & Return Engine Service
Industrial Injection offers L5P Duramax engine rebuilding through a Repair & Return process. Your existing engine is sent to Industrial Injection for inspection, machining, and rebuilding rather than being exchanged for an engine from available inventory.
Our engine team will review the condition of your engine, confirm the necessary repairs, and establish the final build specifications and pricing.
Contact Industrial Injection before shipping your engine to receive instructions and confirm service availability.
Recommended Components to Inspect
When replacing or rebuilding a Duramax engine, the condition of supporting components plays an important role in the reliability of the completed installation. Industrial Injection recommends evaluating the following:
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Oil Cooler: Inspect for contamination or damage. Replacement may be necessary following a bearing failure.
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Fuel Injectors: Test and inspect before transferring them to the rebuilt engine.
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Turbocharger: Inspect for shaft wear, oil contamination, debris, and other damage.
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Water Pump: Check for wear, leaks, and proper operation.
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Fuel System: Identify and correct contamination or component failures before installation.
Warranty & Engine Break-In
Industrial Injection provides warranty coverage according to the approved engine configuration and applicable written engine warranty policy.
Proper installation and break-in are essential. Follow the current Industrial Injection engine break-in instructions, including the required break-in oil and initial oil change interval. Confirm warranty registration requirements with the engine team.
Contact Our Engine Team
Need an L5P Duramax replacement engine? Our engine specialists can review your application, explain the Stock Long Block rebuilding process, and help determine the correct solution for your truck.
Call 800-955-0476 to discuss your engine and request a quote.
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