Fleece Performance GM LSR Freedom Series Standard Deck Solid Aluminum Block - Part Number FPE-LSR-FMJ-SD10X

Increased Coolant Flow, Decreased Coolant Temperatures The rear cylinders on the 5.9/6.7L Cummins suffer from a lack of coolant flow, and therefore, experience the highest coolant temperatures. This can cause excessive pressure to build in the cooling system, especially the rear of the block and blow out freeze plugs externally, or the smaller diameter plugs under the valve cover, leading to a failure. Our coolant bypass kit adds a secondary thermostat, that unlike other brands, works based on temperature instead of excessive pressure. This solves the problem before pressure becomes an issue by ensuring consistent temperatures across all six cylinders. Benefits: Lowers coolant temperature at the rear cylinders Ensures consistent temperatures across all cylinders Prevents damaging coolant pressure build up Complete kit comes with braided hose and AN O-ring fittings to ensure a leak-free installation. Kits for MY 2003+ include billet hose brackets. Why do I need a Fleece Coolant Bypass? One of the biggest issues on the 5.9/6.7L Cummins is the coolant flow problem to the rear cylinders. This can cause catastrophic failure or blow outs of the freeze plugs in an over-temperature / over-pressure condition. The Fleece Coolant Bypass is one of the most important additions you make to improve the reliability and longevity of the Cummins platform. Application Notes: The 2003 - 2007 5.9L automatic transmission version will eliminate the factory transmission fluid heat exchanger. The heat exchanger is designed for use in cold climates to warm the transmission fluid with the engine coolant.

• Billet main caps: Premium billet construction ensures stability and precision fitment. Utilizes 7/16-14 main studs and M10 side bolts along with dowels on the inner studs of the block for superior clamping and reliability.
• Enhanced design: Includes additional stock to the front and rear valley walls for increased strength along with minimum 0.625-inch skirt wall thickness.
• Priority Oil System: Oil rifling provides priority oil feed to the critical bottom-end components, reducing heat, wear, and risk of failure.
• Ductile iron sleeves: Provide a durable wear-resistant surface with improved shock absorption to handle high-performance applications.
• Complete reinforced exoskeleton combined with Hot Isostatic Pressing (HIP) ensures the highest quality casting available.
• Cross-braced lifter valley: Provides added structural integrity and individual drain backs for improved reliability.
• Heavy-duty deck thickness: Features a robust 0.750-inch deck thickness for enhanced durability.
• Lightweight: Weighs only 120 pounds with main caps, offering a strong yet lightweight solution.
• Maximized crankshaft saddle radius: Optimized for performance under high-stress conditions.
• Exclusive domed main cap design provides for maximum crankshaft support.

The Fleece Performance GM LSR Freedom Series Standard Deck Solid Aluminum Block is engineered for high-performance applications, offering exceptional strength and durability for your vehicle. Crafted from premium billet aluminum, this engine block features reinforced exoskeleton construction combined with Hot Isostatic Pressing (HIP) technology, ensuring the highest quality casting and structural integrity. Designed to withstand extreme conditions, it includes additional stock to the front and rear valley walls for increased strength and a minimum 0.625-inch skirt wall thickness for added durability.

The block incorporates a heavy-duty 0.750-inch deck thickness, providing enhanced reliability and longevity under demanding performance scenarios. Weighing approximately 120 pounds with main caps, it delivers a lightweight yet robust solution for high-stress environments. The maximized crankshaft saddle radius and exclusive domed main cap design offer superior crankshaft support, reducing the risk of failure and ensuring smooth engine operation. The cross-braced lifter valley enhances structural integrity and incorporates individual drain backs for improved reliability, making this block suitable for racing or heavy-duty use.

Fleece Performance’s design emphasizes oil management with a Priority Oil System that provides dedicated oil rifling to critical bottom-end components, reducing heat and wear. The inclusion of ductile iron sleeves offers a durable, wear-resistant surface with improved shock absorption capabilities, further extending engine life. This complete engine block is ideal for enthusiasts seeking a high-performance, reliable foundation for building or rebuilding an engine. It is important to note that application specifics include compatibility with various models, and certain features like the elimination of the factory transmission fluid heat exchanger for 2003-2007 automatic transmission versions, making it a versatile choice for performance upgrades.

Whether you’re building a race engine or a heavy-duty powerplant, the Fleece LSR Freedom Series Solid Aluminum Block provides the structural strength and advanced engineering needed to maximize performance and reliability across demanding applications. This product is designed for professionals and serious enthusiasts who demand the best in engine performance and durability, ensuring your engine’s longevity and peak operation under extreme conditions.

Features:

• Billet main caps: Premium billet construction with 7/16-14 main studs, M10 side bolts, and dowels for superior clamping and reliability

• Enhanced design: Additional stock to front and rear valley walls for increased strength and a 0.625-inch skirt wall thickness

• Priority Oil System: Oil rifling provides dedicated oil flow to bottom-end components, reducing heat and wear

• Ductile iron sleeves: Durable, wear-resistant with improved shock absorption for high-performance use

• Complete reinforced exoskeleton: Hot Isostatic Pressing (HIP) ensures the highest quality casting

• Cross-braced lifter valley: Adds structural integrity with individual drain backs for better reliability

• Heavy-duty deck: 0.750-inch thickness for enhanced durability under demanding conditions

• Lightweight design: Weighs approximately 120 pounds with main caps for a strong yet manageable engine block

• Maximized crankshaft saddle radius: Optimized for high-stress performance

• Domed main cap design: Provides maximum crankshaft support for engine stability

Air Freight Prohibited: false
Not Carb Approved: true
Carb Acknowledgement Required: true
Ltl Freight Required: true
Prop 65: Y
Part Type: automotive
Epa: N/A
Regular Stock: t
Units Per Sku: 1