Current Lead Times: In Stock Engines Ship Same or Next Day - Out of Stock: 1-3 Weeks on Most Long Block Engines; 3-5 Days on Heads – *call us for more exact lead times for your specific build 

6.6L 2007-2010 Duramax LMM Long Block Workhorse Diesel Crate Engine

UPC : 659657019134


6.6L LMM Duramax Long Block Workhorse series engines: 600 HP rated. Designed with the working man in mind. The perfect platform for those who do heavy hauling regularly.

6.6L Long Block Workhorse LMM Engine 2007.5-2010 – Duramax Diesel Engine.

This build Includes:

  • Our Built-In-House O Ringed Heads
  • Stage 2 Camshaft
  • Chromoly Push Rods
  • Flycut, Coated, and Delipped Pistons
  • Pressure Test Heads
  • Remanufactured Valves
  • New Induction Hardened Seats
  • All New Valve Guides
  • Install New Valve Seals
  • Test Spring Tension
  • New Freeze Plugs
  • Keyed Crankshaft
  • Head Studs

Machining Processes

  • Full CNC blue print machining, (bore, deck, hone and line honed)
  • The Cylinder bores are blue print bored to a true 90 degrees over the crankshaft center line
  • Diamond honed to within .0002 inch for precise piston to cylinder bore clearance.
  • Bored and line hone the crank bore housing to precisely align the crankshaft in the engine block.
  • Torque Plate Honed
  • The piston diameter measured to the nearest .0001 inch matched to cylinder bores.
  • The Cylinder block is surfaced to a finish of RA30 or lower, which meets the factory specification in both flatness and smoothness for the block to head sealing surface.
  • This is mandatory for proper sealing of a MLS Gasket.

Flexplate for Automatic transmission. (If you are using this for a manual transmission we highly suggest sending in your flywheel and pressure plate so we can achieve the best balancing job possible for your engine. Also, now is a great time to upgrade your clutch. Get with our team to talk about the options we have available for you!)

  • Check both wrist pin and crank pin to rod clearances
  • New Upgraded Pistons .10 – .30 inch over – New Pistons, Rings, Pin Retainers weight matched prior to crank balancing
  • New OE Lifters
  • Lifter Guides
  • OE Crank Flange Bolts
  • Crankshaft – Balanced and Matched Rotational Assembly
  • Crankshaft is Polished and ground to .0005 concentricity or less
  • Camshaft – Polished and Inspected
  • New Rod, Main and Cam Bearings
  • Install Rear Main Seal
  • Install New Rear Cover Gasket
  • Install Upper and Lower Oil Pan Gaskets
  • Install Pickup Tube O-ring
  • Rear Cover Installed
  • Connecting Rods
  • New Damper

  What you need to know about Choate Vs. the Competition. We have put together a list of videos for all processes we do to this engine. It is your responsibility to educate yourself about the differences. To do so we made that easier with this compilation of videos!

This is why we machine the crankshaft for an upgraded keyway!

What is Blueprint Boring?

This is why we square deck the block!

Why the WorkHorse Engine Comes with O-Ringed Heads

What’s the big deal about Choate Camshafts?

This is why we balance the rotational assembly!

This is why we torque plate hone!

Why we only use the Rottler hone for YOUR engine!

Why do we encourage you to buy a long block instead of a short block?

On the fence on which engine you should buy? Daily Driver VS WorkHorse Engine.






Assembled by Our Professional Team in house.

6.6L Duramax LMM Long Block Workhorse series engines: 600 HP rated. Designed with the working man in mind. The perfect platform for those who do heavy hauling regularly. Fully balanced and blueprinted.

  • 6.6L 2007.5-2010 Duramax LMM
  • Long Block
  • Workhorse Diesel

Upgrades From Daily Driver include but are not limited to:

  • Chromoly Pushrods
  • Stage 2 Cam Shaft
  • O-Ringed Heads
  • Coated, Flycut and Deliped Pistons, Torque Plate Honing

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