2011-2016 GM Duramax 6.6L LGH


Remanufactured Short Block & Long Block

66D-LGH-1116BTB

$9,899.00 CAD
$9,899.00 CAD
Shipping calculated at checkout.
Engine Series: Back To Basics (BTB)
All Features of the LML Back To Basics (BTB)
  • Bored & oversize diamond-honed cylinders & resurfaced block decks
  • Remanufactured heads with new guides and 3-angle seat cuts
  • Precision-tested valves & springs
  • New exhaust valves
  • Assembled as a bare long block
  • Square keyed crankshaft & camshaft
  • Block finished in high gloss black engine enamel
  • Crankshaft, camshaft, pistons, rods, valves, & springs installed
Additional add-ons available upon request
  • HD valve springs
  • Upgraded head studs
  • Upgraded camshaft
  • Upgraded pushrods
  • Ceramic coated & delipped pistons
Build Overview
Engine Type
LGH Diesel
Configuration
90° V8, OHV, 32V
Displacement
6.6 Liters
Fuel System
Common Rail Diesel
Application
2011-2016 GM HD Trucks
Assembly
In-House Reman
Tuning Available
HP Tuners MPVI4 tuning device
  • Custom tuning available for this engine
  • HP Tuners & EZ LYNK support
  • Remote tuning revisions
  • Built around your truck setup
  • Setup guidance after install
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Built With The Best

Fill out the following to order your engine online
Inquire Now Build Process & Features

There are 2 Refundable Core Deposits for our engines. You can learn more about our core return policy here.

BTB Series Engine Core - $2,000

BTO, Power & Pull, Power & Performance Series Engine Core - $3,000

Shipping Container Core - $500

Note: Cleaning fees may be deducted from the core deposit if the crate is dirty with spilled oil/coolant.

Click here to view our current Warranty Policy information.

Payments

If you order directly through our website, payment will be captured at checkout.

If you inquire online, payment details for our engines will be determined after your order has been placed. We accept credit, debit, EFT, and certified bank drafts.

Shipping

Once your build is complete, orders usually deliver within 1-2 weeks. Shipping charges may be subject to change.

Inquiry Form

LGH BUILD PROCESS
⚙ ✓
01
TEARDOWN

Core Inspection

Start with the right foundation

Every build starts with a complete teardown and core inspection. We strip the engine to bare components and check the block, crankshaft, rods, pistons, cylinder heads, and hardware for wear patterns, damage, cracks, previous machine work, and signs of failure. This inspection tells us what can be reconditioned, what needs machining, and what gets replaced.

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Core Inspection

Learn more about the PML LGH

Internal Components

LGH Valvetrain

We use new exhaust valves and inspect the pushrods, rockers, lifters, springs, retainers, locks, valve seals, and related hardware before and during assembly. Pushrod condition, valve lash, spring setup, and overall valvetrain geometry are all checked to help prevent common issues like poor valve control, noise, misfire concerns, or premature component wear. For higher-demand builds, HD valve springs, upgraded pushrods, and camshaft upgrades are available to further improve valvetrain stability.

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Valvetrain
Quality Control

Engine Blueprinting

Every critical component is measured, verified, and documented to ensure the entire rotating assembly and long block are built to exact tolerances. We measure crankshaft journals, bearing clearances, connecting rods, pistons, ring gaps, cylinder bores, and deck surfaces, as well as valvetrain geometry and final assembly checks. This process helps ensure consistency, proper fitment, improved reliability, and a higher level of quality in every PML engine.

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Blueprinting
Internal Components

LGH Rotating Assembly

We install new pistons, rings, bearings, and rod bolts, with crankshaft journals, bearing clearances, rod sizing, piston fitment, and ring gaps all measured before final assembly. The crankshaft is digitally spin balanced on our CWT Multi-Bal 550 to precise tolerances, helping reduce vibration and improve overall engine smoothness. For added reliability, the crankshaft and camshaft are square keyed to strengthen timing gear retention and help address a known Duramax weak point under load.

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Rotating Assembly
Machining

LGH Cylinder Heads

Our LGH cylinder heads are remanufactured, machined, and assembled in-house so we can control the full process from start to finish. Each head is inspected before machining, with attention paid to deck surface finish, valve seat condition, guide wear, and overall casting quality. From there, the heads are resurfaced, machined as needed, assembled, and pressure tested to ensure strong sealing, consistent valve operation, and a reliable finished long block.

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Cylinder Heads
Machining

LGH Block

Our blocks are machined and honed in-house on our Rottler F69A and H85AX machines. Each block is inspected, machined, and finished with attention to deck surfaces, cylinder bore condition, mainline alignment, and final hone finish. The cylinders are precision-honed for proper piston and ring fitment, helping support ring seal, oil control, and long-term durability in the finished build.

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Engine Block