XP1 LM7 5.3L Vortec Long Block Crate Engine

The Xtreme Performance LM7 5.3L Vortec Long Block Crate Engine is a professionally remanufactured unit engineered for dependable performance and enhanced durability in compatible 1999-2007 GM trucks and SUVs. Originally introduced in 1999, this 3rd generation LM7 features a cast iron block paired with aluminum cylinder heads, commonly found in select Cadillac, Chevrolet, and GMC full-size models. Each XP1 series long block undergoes a comprehensive remanufacturing process, including complete disassembly, thorough cleaning, precision machining, and careful reassembly with upgraded internal components. The engine is built to meet factory fitment specifications for proper installation in compatible applications. Every LM7 Vortec block is magnaflux inspected for flaws or cracking, then thermally cleaned and steel microblasted. Precision boring and honing processes, along with computerized micrometers for resizing rods and precision-cut crankshafts, ensure adherence to factory recommendations. Cylinder heads are meticulously milled for perfect alignment and sealing, and assembled with new valve stem seals featuring high-temperature technologies. Pressure and vacuum testing of cylinder heads and seals, along with triple-angled cutters for valve seats, ensure optimal performance and longevity. All valves, valve springs, and guides meet or exceed OEM specifications.