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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 LQ4 6.0L 535 hp base long block crate engine is fitted with LS3 heads. Engine specifications: * Horsepower: 535 * Torque: 485 * Block: OE LQ4/LQ9 6.0L iron * Bore/stroke: up to 4.030 in. x 3.622 in. * Displacement (cu.in): up to 371c.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: -- ATK LS3 rectangular port aluminum -- 69cc/255cc -- 2.160 in. intake/1.600 in. exhaust * Rocker arms: OE 1.7 ratio with trunnion upgrade * Oil pump: Melling M295
Not Yet Reviewed
$5,199.99
ATK High Performance GM 415 LS3 Stroker 620 hp Stage 1 long block crate engines make big horsepower, producing big mid- to upper-end power with a noticeable idle. ATK Stage 1 or base engines are designed for those that may have their own component parts already, and who also are interested in completing out the build themselves. Typically ATK GM 415 LS3 Stroker 620 hp base engines consist of: * New GM LS3 block * Forged 4340 crankshaft * Forged H-beam connecting rods * Forged 2618 pistons * Chromoly piston rings * Hydraulic roller camshaft * Performance aluminum cylinder heads * OE rocker arms with trunnion upgrade * Timing set
Not Yet Reviewed
$10,598.99
ATK High Performance GM 415 LS3 Stroker 620 hp Stage 3 long block crate engines are designed to be real powerhouses with great top-end power. ATK Stage 3 or complete-dressed engines are designed for those wanting to drop the engine into their project and fire it up. They have outfitted the engines as completely as possible to save you time and headaches. Typically ATK GM 415 LS3 Stroker 620 hp complete dressed engines consist of: * New GM aluminum L92/LS3 block * 4340 forged crankshaft * 4340 forged H-beam connecting rods * Forged pistons * Chromoly piston rings * Hydraulic roller camshaft * LS3 aluminum cylinder heads * GM roller rocker arms * Timing set * Oil pan, oil pump and pick-up tube * Performance intake manifold * Carburetor
Not Yet Reviewed
$13,819.99
ATK High Performance LS GM 408 600 hp long block crate engines make an impressive 545 ft./lbs. of torque! They are built with a forged crankshaft, forged pistons, and forged connecting rods, factory LS3 cylinder heads 68.4cc combustion chambers, Victor Jr. intake manifold and 850 cfm carburetor. The engines are equipped with a LS7 hydraulic roller camshaft. 1.7 ratio roller rocker arms, aluminum oil pan, aluminum timing cover, harmonic balancer, spark plugs, ignition wires, ignition coils, and valve covers to complete the bone crunching LS power.
Not Yet Reviewed
$12,010.99
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
Not Yet Reviewed
$7,899.99
ATK High Performance GM LM7/LS1 515 hp+ Stage 1 long block crate engines offer streetable horsepower producing big mid- to upper-end power with a noticeable idle. ATK Stage 1 or base engines are designed for those of you that may have component parts already and want to complete the build yourself. Typically, ATK GM LM7/LS1 515 hp+ base engines consist of: * LM7 5.3L Gen III iron block * K1 4340 forged crankshaft * Forged I-beam connecting rods * Forged pistons * Piston rings * Hydraulic roller camshaft * CNC-ported cathedral port cylinder heads * OE rocker arms with trunnion upgrade * Oil galley plugs are installed and sealed All LS long blocks will include: * LS2 lifter trays * LS7 high-rev lifters * Melling high-pressure oil pump * SA Gear billet timing chain with 9 keyway adjustment
Not Yet Reviewed
$7,898.99
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