Fleece Freedom Series wet-sleeve aluminum LSR block front view with ductile liners
Top deck view of Fleece Freedom Series wet aluminum LSR block showing 4.125" bores
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Fleece Performance GM LSR Standard Deck Wet Aluminum Engine Block

FPEFPE-LSR-SD10X
732777409730
Engines
2 Units In Stock - Ships Next Business Day
$ 6,750.00
$ 6,750.00

SKU: FPE-LSR-SD10X   |   UPC: 732777409730

Fleece Performance Freedom Series Wet Aluminum Billet Block - GM LSR Standard Deck (10X) with Ductile Iron Sleeves

The Fleece Performance Freedom Series wet-sleeve aluminum block for the 2024+ LSR Duramax delivers a repairable, high-horsepower capable platform that saves over 100 lbs versus the factory iron block while providing better heat transfer and cylinder sealing. CNC-machined from a single 6061-T6 aluminum forging and equipped with centrifugally cast ductile iron wet sleeves, this standard-deck block supports 2,500+ horsepower builds in street trucks, hot-street pullers, or competition engines where long-term serviceability and reliability remain priorities.

Key Features

  • Wet Ductile Iron Sleeves: Replaceable high-strength liners handle extreme cylinder pressure and allow future rebuilding.
  • Standard Deck Height: 9.760" direct replacement for 2024+ LSR 6.6L Duramax engines.
  • Thick Decks & Reinforced Mains: Minimum 0.750" deck thickness and heavy main webbing reinforcement.
  • Bore Size: Ships finish-honed at 4.125" (supports up to 4.250" overbore).
  • Improved Oiling: Enlarged galleries for high-volume pumps and roller cam bearings.
  • Cam Bore: Machined to 65mm for roller bearing cams.
  • Weight: Approximately 110-115 lbs (100+ lbs lighter than OEM iron block).
  • Made in USA: Fully machined and inspected at Fleece Performance in Indiana.

Product Notes

  • Part number: FPE-LSR-SD10X (wet-sleeve version for 2024+ LSR).
  • Block arrives torque-plate honed, align-honed, decked, and ready for assembly.
  • Fits all factory LSR oil pans, timing covers, valley plates, and accessories.
  • Piston oil squirter provisions retained (can be blocked for race use).
  • Accepts ARP main studs and standard Duramax fasteners.
  • Ideal for street-driven high-horsepower trucks that may need future cylinder service.

Installation Notes

  • Professional race engine builder assembly required.
  • Deck surface RA 15-20 finish compatible with MLS or copper head gaskets.
  • Billet main girdle recommended above 1,800 hp.
  • No core charge new billet block.

This Part Fits

Year Make Model Engine Notes
2024-2026 Chevrolet Silverado 2500/3500 LSR 6.6L Duramax Standard Deck Wet Sleeve
2024-2026 GMC Sierra 2500/3500 LSR 6.6L Duramax Standard Deck Wet Sleeve

Why Choose Fleece Performance?

  • Proven in 2,000–2,500+ HP street and pulling trucks nationwide.
  • Every Freedom Series block individually machined and inspected in-house.
  • Combines aluminum weight/heat benefits with ductile sleeve durability and repairability.

Frequently Asked Questions

  • Q: How does the wet-sleeve block differ from the solid aluminum version?
  • A: Wet-sleeve uses replaceable ductile iron liners for easier future repair and slightly more weight, making it better for street and heavy-use applications.
  • Q: What bore size is it delivered at?
  • A: Finish-honed at 4.125" ready for standard or stroker pistons.
  • Q: Do factory LSR heads bolt directly on?
  • A: Yes, identical bolt pattern, dowels, and coolant passages to the OEM LSR block.

Shipping & Handling

  • Method: Freight truck only (wood crated, fully insured).
  • Package Weight: Approximately 200–220 lbs (block + crate).
  • Crate Dimensions (approx): 42" × 28" × 28" reinforced wood crate with foam.
  • Availability: Typically ships same day or next if in stock otherwise these are Built to order – typical lead time 8–14 weeks.

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