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ATK High Performance Chevy LQ4 6.7L 500 HP Long Block Crate Engines

ATK High Performance Chevy LQ4 6.7L 500 HP long block crate engines are designed to be used with a Turbo or Supercharger up to 15 psi. ATK engineered these engines to be affordable yet strong enough to handle a good amount of boost! Engine Specifications: * HP: 550 * TQ: 535 * Block: GM 6.0L iron LQ4 with ARP main studs * Bore/Stroke: 4.030 in. x 4.000 in. * Displacement (cu.in): 408 * Crankshaft: Manley 4.000 in. stroke internally balanced 24-tooth reluctor wheel * Rods: Manley 4340 Forged 6.125 in. H-beam with ARP 2000 bolts * Pistons: Forged * Compression ratio: 10.2:1 * Rings: Total Seal CS/AP with steel top ring * Camshaft: Hydraulic roller * Cam specs: 226/230 at 50 .600/.575 113LSA * Cylinder heads: ATK LS3 aluminum 68cc 2.165 in. / 1.590 in. valves * Rocker arms: OE powdered metal 1.7 ratio with trunnion upgrade * Oil pump: Melling 10296 high volume Recommended Components: • Oil: 10W30 • Oil filter: Wix • Fuel system – OE EFI system or aftermarket • Intake – Stock fuel injected or aftermarket • Balancer -- Stock internally balanced • Flex plate/Flywheel -- Stock internally balanced • Timing -- Set to factory specifications via PCM module (tune required) • Spark plug: NGK BR7 • Tuning: Chassis dyno tune required • Firing order -- Stock • Fuel – 91+ Octane • Recommended stall converter -- 2800+ based on application • Headers -- 1 7/8 in.+ depending on application

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