SKU: FPE-LTR-SD10X | UPC: 732777409792
Fleece Performance Freedom Series Wet Aluminum Billet Block – GM LTR Standard Deck (10X) with Ductile Iron Sleeves
The Fleece Performance Freedom Series wet-sleeve aluminum block gives LTR/L5P builders a durable, repairable platform capable of 2,500+ horsepower while saving over 100 lbs compared to the factory cast-iron block. Machined from a massive 6061-T6 aluminum forging and fitted with high-strength ductile iron wet sleeves, this standard-deck block combines the heat dissipation and weight advantages of aluminum with the proven durability and cylinder sealing of a sleeved design ideal for daily-driven high-performance trucks or competition engines that still need long-term reliability.
Key Features
- Wet Ductile Iron Sleeves: Centrifugally cast sleeves support extreme cylinder pressure and allow easy replacement if ever needed.
- Standard Deck Height: 9.760″ direct drop-in for 2020+ L5P/LTR Duramax engines.
- Thick Decks & Main Webbing: 0.750″ minimum deck thickness and heavily reinforced mains.
- Bore Size: Ships finish-honed at 4.125″ (supports up to 4.250″ overbore).
- Enlarged Oil Galleries: Improved lubrication for high-volume pumps and big roller cams.
- Cam Bore: Machined to 65mm for roller bearing camshafts.
- Weight: Approximately 110-115 lbs (100+ lbs lighter than OEM iron block).
- 100% USA Machined: Produced and inspected at Fleece Performance in Indiana.
Product Notes
- Part number: FPE-LTR-SD10X (wet-sleeve version).
- Block arrives fully machined: torque-plate honed, align-honed, decked, and ready for assembly.
- Compatible with factory LTR oil pans, timing covers, valley cover, and accessories.
- Retains piston oil squirter provisions (can be blocked if desired).
- Accepts ARP main studs and all standard Duramax fasteners.
- Designed for street/strip and sled-pulling trucks that require serviceability.
Installation Notes
- Professional engine builder assembly required.
- Deck surface RA 15-20 works with MLS or copper head gaskets.
- Recommended with billet main girdle above 1,800 hp.
- No core charge brand-new billet block.
This Part Fits
| Year | Make | Model | Engine | Notes | |
|---|---|---|---|---|---|
| 2020-2025 | Chevrolet | Silverado 2500/3500 | L5P / LTR 6.6L Duramax | Standard Deck Wet Sleeve | |
| 2020-2025 | GMC | Sierra 2500/3500 | L5P / LTR 6.6L Duramax | Standard Deck Wet Sleeve |
Why Choose Fleece Performance?
- Trusted by top Duramax racers and daily drivers for reliable high-horsepower components.
- Every Freedom Series block is individually CNC-machined and quality-checked in-house.
- Offers the perfect balance of weight savings, heat transfer, and long-term durability.
Frequently Asked Questions
- Q: What is the difference between this wet-sleeve block and the solid version?
- A: The wet-sleeve block uses replaceable ductile iron liners for easier repair and slightly higher weight, making it better suited for street or heavy-towing trucks.
- Q: What bore does it come with?
- A: Finish-honed at 4.125″ ready for standard or stroker pistons.
- Q: Do factory LTR heads bolt on?
- A: Yes, identical bolt pattern, dowels, and coolant passages to the OEM block.
Shipping & Handling
- Method:: Freight truck only (wood crated, insured).
- Package Weight: Approximately 200220 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 814 weeks.
