PRECISION PLUS LONG BLOCK ENGINE CHEVROLET/GMC SILVERADO/SIERRA 6.6L LML 2011-2016

• Complete Remanufactured Long Block: Fully rebuilt to D&J Precision Machine specifications for a reliable replacement engine.
• Precision Machined: CNC blueprinted, bored, honed, and deck surfaced for precise cylinder geometry and proper piston fit. Each crankshaft is checked for straightness and size and repaired as needed.
• New OEM-Spec Tier 1 Pistons and Rings: Provides a high-quality piston and ring package for proper fit, sealing, and consistent engine performance.
• Upgraded L5P Oil Cooler: Improves engine oil cooling to help maintain lower oil temperatures and reduce the risk of piston cracking and related engine failure.
• Remanufactured Cylinder Heads: Resurfaced and fitted with recut valve seats and new valves for proper sealing and reliable valve operation. The upgraded L5P top-hat valve stem seal design helps prevent valve seal failure and improve long-term durability.
• Upgraded ARP Head Studs and MLS Head Gaskets: Provides increased clamping strength and reliable cylinder sealing to help address common LML head gasket failure.
• Pinned Oil Pump: Secures the oil pump to help prevent pump rotation and maintain consistent oil pressure.
• Keyed Crankshaft and Camshaft: Addresses a known failure point by providing positive mechanical retention between the shaft and gear, helping prevent unwanted movement and related component failure.
• New Bearings and Thrust Washers: Restores proper internal clearances and supports reliable engine operation.
• New Valves: New high-quality valves provide reliable sealing and consistent valve operation for improved long-term durability and performance.
• New Valve Springs: Restores proper valvetrain operation and performance.
• Rocker Boxes, Valve Covers and Intake Manifolds Included: Reduces component transfer and installation time for a more complete replacement package.
• Complete Rotating Assembly: Includes the harmonic balancer, flywheel, flex plate, flex plate washer, and new mounting hardware.
• Precision Assembly: Critical engine dimensions and clearances are verified throughout the build for consistent quality.
• In-House RMC Engine Testing: Before shipment, every engine is mounted on D&J's dynamic engine test system and rotated at speed while sensors measure oil pump pressure and volume, cylinder compression, and cooling system integrity. This lets D&J catch internal issues in-house, before the engine ever reaches your truck.
• Built for Everyday Use: Designed to provide reliable performance for everyday driving, and towing applications.

The D&J Precision Machine Precision Plus Long Block is a complete replacement engine solution for 2011-2016 GM 6.6L LML Duramax applications. Each engine is completely disassembled, cleaned, inspected, precision machined, and rebuilt to D&J Precision Machine specifications.

The block is precision machined and matched with OEM-spec Tier 1 pistons and rings as required for proper fit and performance. Cylinder heads are inspected and resurfaced with recut valve seats and new valves. The upgraded L5P top-hat valve stem seal design helps prevent valve seal failure and improve long-term durability.

The engine is assembled with Tier 1 MLS head gaskets and upgraded ARP head studs for improved sealing and clamping strength. An upgraded L5P oil cooler helps maintain lower engine oil temperatures and reduce the risk of piston cracking and related engine failure.

The oil pump is pinned to help prevent oil pump rotation and loss of oil pressure. The crankshaft and camshaft are keyed to provide positive timing and component retention.

New bearings, thrust washers, lifters, valve springs, and freeze plugs are installed as part of the remanufacturing process.

The Precision Plus Long Block is the most complete LML long block available, reducing parts transfer and installation time. Each engine comes with the valvetrain, rocker boxes, valve covers, and intake manifold pre-installed. It also includes the harmonic balancer, flywheel, mounting hardware, upper gasket kit, oil filter, and break-in oil.

Each engine is measured and tested in-house using D&J Precision Machine's RMC ETS test equipment before shipment. The engine undergoes a controlled test sequence to verify key operating conditions, including oil pump pressure and volume, cylinder compression, and cooling system integrity. This in-house testing allows D&J to identify potential issues before the engine leaves the facility, providing an additional level of quality control and helping ensure the completed long block is ready for installation and service.

The result is a professionally remanufactured LML Duramax long block designed to provide dependable performance for everyday driving and towing applications.