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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.

Request For Information

Have questions about Fleece Performance GM LSR Freedom Series Standard Deck Solid Aluminum Block? Fill out the form below and we'll get back to you by the next business day.
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