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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.
| 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 |
This engine parts collection covers oil catch cans, thermostats, thermostat housings, radiator components, coolant accessories, engine covers, fuse box covers, cap covers, throttle bodies, supercharger pulleys, idler pulleys, tensioner pulleys, and engine bay dress-up parts for trucks, SUVs, muscle cars, boosted builds, high-horsepower street cars, and performance vehicles that need better reliability, cooling, airflow, oil control, and under-hood styling. The collection is particularly strong for Dodge Challenger, Charger, Durango, Jeep Grand Cherokee Trackhawk, and Ram TRX platforms running 6.2L Hellcat, 6.4L HEMI, and 5.7L HEMI engines, where oil catch can and cooling upgrades address known OEM weaknesses in the PCV and thermal management systems. Import performance platforms including GM LS-based builds, Chevrolet Camaro, and Corvette applications are also represented through Mishimoto, CSF, and ZPE GripTec product lines. Builders who invest in engine bay organization and reliab...
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This engine block collection covers bearings, gaskets, engine mounts, block off plates, block heaters, PCV valves, sleeves, and engine bay accessories for performance builds, engine refreshes, OEM-style replacement, diesel truck upgrades, HEMI builds, Hellcat and Trackhawk platforms, LS swaps, Honda swaps, Nissan VR38DETT builds, and Toyota truck engines. Main bearings, rod bearings, and connecting rod bearings from ACL Race Series, King Engine Bearings, and Clevite are the most critical internal components for builders refreshing the rotating assembly on street cars, drag builds, or engines being prepared for forced induction. Engine mounts and polyurethane mount upgrades from Innovative Mounts and Kartboy address drivetrain movement in sport compact and high-torque performance applications. Gasket kits from Cometic and MAHLE seal the oil, coolant, and exhaust passages in both stock-displacement and overbore engine combinations.Popular UpgradesBest-selling products include ACL Race...
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Complete crate engines, long blocks, and short block assemblies give builders a reliable, matched-component starting point for engine swaps, restorations, and high-output project builds where sourcing a core and rebuilding from scratch costs more in time and risk than a professionally assembled replacement. The most sought-after crate engine platforms include the GM LS family in 5.3L, 6.0L, and 6.2L displacements, the Ford 5.0L Coyote and 7.3L Godzilla, the Chrysler 6.4L Apache HEMI, and small block and big block Chevy stroker combinations in displacements from 383 to 496 cubic inches. Long block assemblies include cylinder heads, camshaft, and valvetrain already installed, simplifying installation for most engine bay configurations, while short block assemblies are the preferred starting point for builders who want to specify their own top end components for a custom power and compression target. The swap market for all these platforms is mature, with engine mounts, wiring harness ...
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Fleece Performance Engineering has grown from a small Indiana operation into one of the most respected names in high-performance diesel upgrades, with a product catalog built specifically around the Duramax and Cummins common rail diesel platforms that dominate the high-horsepower diesel community. Founded by brothers Brayden and Chase Fleece in a rural west-central Indiana pole barn, the company established itself as a technology leader in common rail injection systems within five years, developing the Cheetah turbocharger line and the TurboBrake electronic exhaust brake that have become standard references for what diesel performance engineering can achieve. Fleece operates from an 18,750-square-foot Brownsburg, Indiana facility capable of in-house design, manufacturing, assembly, and testing, placing them among the high-output diesel specialists who supply race teams and serious street performance builds. This collection covers Fleece Performance's full range of Duramax and Cummi...
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