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Fleece Performance Freedom Series solid aluminum LSR Duramax billet block front view
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Fleece Performance GM LSR Freedom Series Standard Deck Solid Aluminum Block

FPEFPE-LSR-FMJ-SD10X
732777409761
Engines
1 Units In Stock - Ships Next Business Day
$ 6,850.00
$ 6,850.00

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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