SKU: FPE-LSR-FMJ-SD10X | UPC: 732777409761
Fleece Performance Freedom Series Solid Aluminum Full-Machined Billet Block – GM LSR Standard Deck (10X)
The Fleece Performance Freedom Series solid aluminum block for the LSR (2024+ 6.6L Duramax) delivers the strongest foundation available for extreme-power builds that push far beyond factory cast-iron block limits. CNC-machined from a single 1,000+ lb 6061-T6 aircraft-grade aluminum forging, this standard-deck block provides massive cylinder wall and deck thickness, enhanced oiling, and approximately 115 lb weight savings while supporting 3,000+ horsepower combinations when paired with proper head retention and girdle systems.
Key Features
- Solid Billet 6061-T6 Aluminum Construction: No sleeves entirely machined from one forging for ultimate rigidity.
- Standard Deck Height: 9.760″ (matches factory LSR block) direct replacement for 2024+ L5P/LSR engines.
- Extra-Thick Decks & Cylinder Walls: Minimum 0.750″ deck thickness and 0.500″+ cylinder walls for extreme pressure handling.
- Bore Capability: Ships finish-honed at 4.125″ bore (supports up to 4.250″ with machining).
- Reinforced Main Webbing: Accepts ARP 625+ or custom main studs with no modification.
- Enlarged Oil Galleries & Improved Oiling: Optimized for high-volume pumps and roller cam bearings.
- Weight: Approximately 95-100 lbs total (vs. ~215 lbs factory iron block).
- USA Made: 100% machined and inspected at Fleece Performance in Indiana.
Product Notes
- Part number: FPE-LSR-FMJ-SD10X (Standard Deck 10X version for 2024+ LSR).
- Delivered fully machined: torque-plate honed, line-honed, decked, and bored to 4.125″.
- Cam bore enlarged to 65mm for roller bearing cams.
- Compatible with all factory LSR oil pans, timing covers, and accessories.
- Requires billet main girdle and high-strength head studs/fire-rings for extreme power levels.
- No factory piston oil squirter provisions (blocked for competition use).
Installation Notes
- Race engine builder assembly only not a drop-in part.
- Deck surface RA 15-20 finish for MLS or copper head gaskets.
- All threads are cut (not cast) uses standard Duramax fasteners.
- No core charge brand-new billet block.
This Part Fits
| Year | Make | Model | Engine | Notes |
|---|---|---|---|---|
| 2024-2026 | Chevrolet | Silverado 2500/3500 | LSR 6.6L Duramax | Standard Deck |
| 2024-2026 | GMC | Sierra 2500/3500 | LSR 6.6L Duramax | Standard Deck |
Why Choose Fleece Performance?
- Proven leader in 3,000+ HP Duramax builds and record-holding trucks.
- Every Freedom Series block individually machined and quality-checked in-house.
- Trusted by top diesel performance and pulling teams across the country.
Frequently Asked Questions
- Q: What bore does it ship with?
- A: Finish-honed at 4.125″. Your engine builder can open it larger if needed.
- Q: Is a main girdle required?
- A: Strongly recommended over 1,500 hp required over 2,000 hp.
- Q: Will factory LSR heads bolt right on?
- A: Yes, identical bolt pattern and dowel locations to OEM LSR block.
Shipping & Handling
- Method: Freight truck only (wood crated and insured).
- Package Weight: Approximately 180–200 lbs (block + protective crate).
- Crate Dimensions (approx): 42″ × 28″ × 28″ reinforced wood crate with foam.
- Availability: Ships same day or next if in stock otherwise this is a Built to order – typical lead time 8–14 weeks.
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