ATK High Performance GM LM7 5.3L with AFR Heads 500 HP Crate Engines with EFI

ATK specializes in muscle. With the highest quality internal parts and dyno-proven combinations of every engine built, ATK is able to add the most bang for your buck and back it up with an industry leading warranty. This ATK High Performance GM LM7 5.3L 500 hp long block crate engine is fitted with AFR heads and FiTech EFI. Engine specifications: * Horsepower: 500 * Torque: 440 * Block: OE LM7/5.3L iron * Bore/stroke: up to 3.903 in. x 3.622 in. * Displacement (cu.in): up to 347c.i.d. * Crankshaft: OE GM 24 tooth reluctor wheel * Rods: OE powder metal * Pistons: Hypereutectic 10.1 compression * Rings: Moly * Camshaft: Hydraulic roller * Cam specs: Custom performance grind * Timing chain: OE single roller * Cylinder heads: -- AFR CNC ported aluminum -- 59cc/200cc -- 2.000 in. intake/1.570 in. exhaust * Rocker arms: OE 1.7 ratio * Oil pump: Melling M295 * EFI System: -- FiTech Ultra port injection LS1 750 hp with transmission control -- Wiring harness and ECM/TCM included * Fuel injectors: FiTech 55 lb. * Spark plugs: Autolite #104 * Spark plug wires: 8mm * Balancer: Stock internally balanced Show Less