Current Lead Times: 1-3 Weeks on Most Engines; 3-4 Days on Heads – *call us for more exact lead times for your specific build 
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6.6L 2004.5-2005 Duramax Short Block Daily Driver LLY Diesel Crate Engine Choate Performance

SKU: CEP66LLYSD
UPC : 659657337672

$8,000.00$9,500.00

CHOATE 6.6L Short Block Daily Driver LLY Engine 2004.5-2005 – Duramax Diesel Engine. Manufacturer: CHOATE Engineering Performance. CHOATE Part Number: CEP66LLYSD
This 6.6L LLY Duramax Short Block Build Includes:

  • Full CNC blue print machining on the 6.6L Engine, (bore, deck, hone and line honed)
  • The Cylinder bores are blue print bored to a true 90 degrees from the crankshaft center line, prior to being diamond honed to within .0002 inch for precise piston to cylinder bore clearances.
  • We main bore and line hone the crankshaft which is honed to precisely align the crankshaft in the engine block.
  • We bore the block back to the crankshaft center line and hone the block to RA13 finish.
  • 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.
  • Connecting Rods, New Damper and Flexplate for Automatic Transmission.
  • Check both wrist pin and crank pin to rod clearances
  • All Manual Transmission Engines will incur additional charges and will be balanced to a stock flywheel.
  • Or if you are using an your Aftermarket flywheel please send in to Choate
  • New Upgraded Pistons .10 – .30 over New Pistons, Rings, Pin Retainers weight matched prior to crank balancing
  • New OE Lifters, Lifter Guides, OE Crank Flange Bolts, updated 9.800 OE Pushrods
  • Crankshaft
  • Balanced with the Rotational Assembly. Checked for run-out inspected for fatigue.
  • Crankshaft is polished and ground to .0005 concentricity or less.
  • Camshaft
  • Polished and Inspected
  • New Rod, Main and Cam Bearings
  • New Pushrods
  • Install Rear Main Seal
  • Install New Bed Seals
  • Install New Rear Cover Gasket
  • Install Upper and Lower Oil Pan Gaskets
  • Install Pickup Tube O-Ring
  • Rear Cover Installed

CHOATE Engineering Performance Crate Engine Features:

500 HP rated.
This CHOATE engine is fully balanced, and is the perfect engine for spirited daily driving, consumer level towing and everyday life.
Upgrades over the Model C include but are not limited to: Torque Plate Honing; Full Engine Balancing; Harmonic Balancer; Head Studs; Valve Seats; Rear Cover and Pickup Tube; Oil Pans; Welded Crank Gear;

Common Issues With The 6.6L Duramax (and how we fix them)

  • Head Gaskets- This was the first Duramax engine to use the variable geometry vane turbo.
  • It was so rely problematic for the failures with head gaskets .While our business is engines we also encourage the customers to fix the cooling issues and update the LLY with the larger later year model LBZ fan and radiator. But we will take care of our end.
  • And that is why we make sure that all our Duramax engines come standard with headstuds.
  • So you don’t blow a gasket.

Optional Parts are not installed. Optional parts are covered under the manufacturer’s warranty and not by CHOATE.

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*If you know your vin number before hand it is very helpful during the quotation period. Please note that this will be required before the engine is built.

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