The Chevrolet Performance LS long block, paired with ATK’s enhanced GM 6.0 engine, is a premier choice for enthusiasts seeking a high-performance upgrade or a robust foundation for custom builds. The LS long block, engineered with proven Gen III and Gen IV small-block technology introduced by General Motors in 1997 with the all-aluminum LS1 in the C5 Corvette, delivers exceptional horsepower and a broad torque band. Featuring a 24X crankshaft trigger and 1X camshaft trigger system, it’s compatible with 1997–2006 Gen III small-block V8s, enabling seamless retrofitting with existing sensors, exhaust systems, and engine mounts. Its advanced design incorporates high-flow rectangular cylinder head intake ports from Gen IV LS3 engines, outperforming earlier Gen III ports, and supports fuel injection with flexibility for stock or custom induction components (requires a Gen IV 6.0-6.2L intake manifold). The ATK-modified GM 6.0 engine, built from a brand-new GM aluminum block (2005–2009 trucks and SUVs), features a performance camshaft package (223/231 @50 .610/.617 112LSA COMP CAM) and non-AFM/DOD configuration, delivering 475 HP and 430 TQ with a 750CFM carburetor, Vic Jr. intake manifold, and 1-7/8" headers (EFI systems increase power). Limited to 50 units, this all-aluminum engine with extra-thick cylinder sleeves includes valve covers and a timing cover (no oil pan or pump), using hypereutectic flat-top pistons (9.9:1 compression) and OE 799/243 aluminum cylinder heads.
Enhance your LS engine with premium components for performance, reliability, and style. The FiTech 70011 Ultimate LS EFI kit offers DIY enthusiasts full engine control with a self-learning ECU, color touchscreen handheld controller for custom tuning and data logging, and compatibility with LS3 and 6.2L L92 truck engines with rectangular port cylinder heads, supporting up to 500 HP. It includes a fabricated sheet metal intake manifold with short runners, a 92mm billet throttle body, 36 lb/hr fuel injectors, wiring harness, wideband O2 sensors, and an engine-only ECU (other FiTech kits support GM transmissions like 4L60E, 4L65E, 4L80E, 4L85E). The Deluxe AN6 LS Swap Fuel Filter Regulator, with an integrated 58psi regulator and 5-micron filter, supports up to 450 HP naturally aspirated, featuring AN6 fittings for direct connection, eliminating adapters, and reducing return line length with a zinc-coated steel housing and mounting bracket. Earl’s Vapor Guard hose (3/8", 225 psi, black) and hose ends (aluminum, black anodized) provide multi-layer protection against modern fuel degradation for leak-free performance. Lightweight aluminum -6 AN to 1/4" pipe adapters ensure precise, leak-proof connections with a 37° sealing angle. The MSD in-line fuel pump (43 gph at 60 psi, 3/8" hose barb inlet/outlet) supports up to 500 HP EFI systems with a clog-resistant roller vane mechanism, made in the USA. These components, backed by trusted engineering from Chevrolet Performance, ATK, FiTech, Earl’s, and MSD, deliver unmatched performance and aesthetics for street or strip applications.
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High-Performance LS Engine: ATK-modified GM 6.0 and Chevrolet Performance LS long block deliver exceptional power for enthusiasts and builders.
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Versatile Compatibility: Supports 1997–2006 Gen III and 2005–2009 LS engines, with non-AFM/DOD configuration for seamless swaps and retrofits.
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Advanced Engine Management: FiTech 70011 EFI kit provides precise tuning for LS3 and 6.2L L92 engines up to 500 HP with a user-friendly interface.
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Optimized Fuel System: Deluxe AN6 fuel filter regulator, Earl’s Vapor Guard hose, and MSD fuel pump ensure efficient, durable fuel delivery for EFI setups.
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Reliable and Stylish Design: Components from ATK, FiTech, Earl’s, and MSD offer trusted craftsmanship with a professional, high-performance aesthetic.
