LSR Standard Deck Solid Aluminum Race Block FPE-LSR-FMJ-SD10X

The LSR-FMJ-SD10X is a premium aluminum Gen V LS Standard Deck Race Block designed for high-performance applications. Engineered with precision and built for durability, this race block delivers unmatched strength and compatibility with OEM LS accessories. Whether you’re upgrading for competitive racing or seeking peak performance, the LSR-FMJ-SD10X ensures reliability and excellence in every detail. Proudly made in the USA, it’s a perfect choice for serious enthusiasts and professionals alike.

Features:

• 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.
• Enhanced design: Includes additional stock to the front and rear valley walls for increased strength along with minimum 0.625-inch skirt wall thickness. Complete reinforced exoskeleton combined with Hot Isostatic Pressing (HIP) ensures the highest quality casting available. 
• 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.  Exclusive domed main cap design provides for maximum crankshaft support.
• Maximized crankshaft saddle radius: Optimized for performance under high-stress conditions.
• Lightweight: Weighs only 120 pounds with main caps, offering a strong yet lightweight solution.
• 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.

Included:

• Durabond GMP-9 cam bearings
• LSR rear cover, rear cover gasket, and hardware
• Plug kit
• Precision ground 1018/1020 Steel cam thrust plate
• Transmission dowel pins
• Oil galley barbel plug
• Rear main seal

Notes:

• Final deck surface (0.011” additional provided on the deck surface)
• Final cylinder hone (sleeve inside diameter of 4.110” provided)
• Final OD on the crankshaft mains (0.003” additional provided for the final hone)

 The camshaft and lifter bores are finish machined and ready for precision bearings and lifters.

Specs:

• Deck Height: 9.251”
• Cylinder Bore: 4.110”
• Maximum Cylinder Bore Size: 4.185”
• Cam Bore: 2.3075" - 2.3088"
• Lifter Bore: 0.8430" - 0.8435"
• Main Bore: 2.7475" - 2.7485"
• Main studs: 7/16”-14, AMS6304 alloy (220,000 PSI tensile strength)
• Head studs: Threaded for 1/2”-13 bolts/studs