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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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