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Fleece Freedom Series wet-sleeve aluminum LTR block front view showing ductile liners
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Fleece Performance GM LTR Freedom Series Standard Deck Wet Aluminum Block

FPEFPE-LTR-SD10X
732777409792
Engines
Out of stock
$ 6,750.00

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 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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