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ATK High Performance Engines was founded in 1936 and continues to set new standards for remanufactured high performance engines. ATK was the first to offer a “new...
ATK High Performance Engines was founded in 1936 and continues to set new standards for remanufactured high performance engines. ATK was the first to offer a “new car” style warranty with its engines—an exclusive 24-month/unlimited mile warranty on every engine! And the company is dedicated to helping you set new standards on the street or track, too. ATK offers its GM, Ford, and Chrysler performance engines in three stages to help you achieve your specific performance goals. Shop Summit Racing for a full line of base, mid-level, and high performance ATK engines built with proven, high-quality components....
ATK High Performance Engines was founded in 1936 and continues to set new standards for remanufactured high performance engines. ATK was the first to offer a “new car” style warranty with its engines—an exclusive 24-month/unlimited mile warranty on every engine! And the company is dedicated to helping you set new standards on the street or track, too. ATK offers its GM, Ford, and Chrysler performance engines in three stages to help you achieve your specific performance goals. Shop Summit Racing for a full line of base, mid-level, and high performance ATK engines built with proven, high-quality components. Give your ride a power transplant with ATK High Performance Engines!
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 GM 408 LQ4 Stroker 600 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 that may have their own component parts already, and who also are interested in completing out the build themselves. Typically ATK GM 408 LQ4 Stroker 600 hp base engines consist of: * 6.0L iron LQ4 Gen III block * 4340 forged crankshaft * Forged H-beam connecting rods * Forged pistons * Chromoly piston rings * Hydraulic roller camshaft * Performance aluminum cylinder heads * OE rocker arms with trunnion upgrade * Timing set
Not Yet Reviewed
$8,997.99
ATK High Performance GM 365 LQ4 550 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 that may have their own component parts already, and who also are interested in completing out the build themselves. Typically ATK GM 365 LQ4 550 hp base engines consist of: * 6.0L iron LQ4 Gen III block * ATK reground crankshaft * Forged I-beam connecting rods * Forged pistons * Chromoly piston rings * Hydraulic roller camshaft * Performance aluminum cylinder heads * OE rocker arms with trunnion upgrade * Timing set
Not Yet Reviewed
$7,798.99
ATK high performance LS3/L92 25cc as cast aluminum cylinder heads are the perfect budget option for your next LS build. These fully assembled heads are capable of making over 600 hp naturally aspirated out of the box and will come loaded with upgraded components. The springs are set up to be used on up to .650 in. lift camshafts. No reason to swap parts on your new heads when running an upgraded cam! -- Features and benefits: * Bronze valve guides * Dual valve springs for .650 in. max lift * CNC-finished faces and bolt holes for extreme accuracy * 355-T6 high density aluminum * Machined for screw in studs and guide plates * All factory components will fit without modification -- Cylinder Head Specifications INTAKE: * Intake Runner Volume (cc): 252 * Intake Port Location: Standard * Intake Valves Included: Yes * Intake Valve Diameter (in): 2.160 in. EXHAUST: * Runner Volume (cc): 78.8 * Exhaust Valve Diameter (in): 1.600 in. * Exhaust Valves Included: Yes * Exhaust Runner: No * Port Shape: Round * Exhaust Port Location: Standard COMBUSTION CHAMBER: * Combustion Chamber Volume (cc): 69.4 * CNC-Machined Combustion Chamber: No VALVE SPECS: * Intake Valve Angle: 12 degrees (3 degrees rolled) * Exhaust Valve Angle: 12 degrees (3 degrees rolled) * Valve Guides Included: Yes * Valve Guide Material: Manganese Bronze * Valve Seats Machined: Yes * Valve Seat Machine Style: 5-Angle * Valve Seat Material: Chrome Nickle * Valve Stem Seals Included: Yes * Valve Stem Seal Style: Viton® Fluoroelastomer SPRINGS: * Valve Springs Included: Yes * Maximum Valve Lift (in): .650 in. * Spring Pressure Open: 370 @ 1.150 * Spring Pressure Closed: 142 @ 1.800 * Outside Diameter of Outer Spring (in): 1.29 in. * Damper Spring Included: Yes * Number of Springs per Valve: Dual * Retainers Included: Yes * Retainer Material: Chromoly Steel * Locks Included: Yes * Lock Style: 7 Degree ROCKER ARMS: * Rocker Arm Studs Included: No * Rocker Arms Included: N/A * Rocker Arm Nut Thread Size (in): 8 x 1.25 * Rocker Arm Nuts Included: No MISC: * Head Style: Assembled * Cylinder Head Material: Aluminum * Cylinder Head Finish: Natural * Spark Plug Style: Standard * Cover Mounting Style: Standard * Steam Holes Drilled: No * Oiling Style: Through Pushrod * Machined for O-Ring: No * Heat Crossover: No * 10mm Accessory Bolt Holes Machined On Ends of Heads
Not Yet Reviewed
$748.99
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 347CI Stage 1 engine 500 hp long block crate engines offer streetable horsepower—producing big mid- to upper-end power with a noticeable idle. The ATK LM7/LS1 engines are designed for individuals that may have their own component parts already, and who may also have an interest in completing out the engine build themselves. Typically ATK GM LM7/LS1 347CI 500 hp base engines consist of: * LM7 5.3L Gen 3 block * OE GM reground 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 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
$7,498.99
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
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
$13,998.99
ATK High Performance GM 365 LQ9 550 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 that may have their own component parts already, and who also are interested in completing out the build themselves. Typically ATK GM 365 LQ9 550 hp base engines consist of: * 6.0L iron LQ9 Gen IV block * ATK reground crankshaft * Forged I-beam connecting rods * Forged pistons * Chromoly piston rings * Hydraulic roller camshaft * Performance aluminum cylinder heads * OE rocker arms with trunnion upgrade * Timing set
Not Yet Reviewed
$7,998.99
With ATK High Performance Chevy LM7 5.3L 385 hp long block crate engines expect big mid to upper end power and a noticeable idle. They were designed to be performance upgrades for a 1999-2007 Chevy truck LM7 or an LS swap in a hot rod. Technical specifications include: * Horsepower: 385+ * Torque: 390+ * Block: GM 5.3L iron LM7 * Bore/stroke: Up to 3.809 x 3.622 * Year range: 1999-2007 * Displacement: 323 c.i.d. * Crankshaft: OEM GM 3.622 in. stroke internally balanced 24 tooth reluctor wheel .857 in. flange * Connecting rods: OE GM forged powder metal 6.093 in. stock bolts * Pistons: Hypereutectic dish * Piston rings: Moly rings * Compression ratio: 9.5:1 compression * Camshaft: Hydraulic roller * Camshaft specifications: Custom grind * Camshaft bearings: Installed and clocked to OEM position * Cylinder heads: OE aluminum 61.15cc 1.89/1.55 * Freeze plugs: Brass installed and sealed * Rocker arms: OE powdered metal 1.7 ratio * Oil Galley plugs: Installed and sealed * Weight: 385
( 15 )
$4,189.99
ATK High Performance Chevy LQ4 6.0L 460 hp long block crate engines lay down impressive power that can be run with factory fuel injection or retrofitted with a carburetor. They're hand-built, balanced, and blueprinted using top-quality parts. Don't waste time trying to salvage a high-mileage short block when you can get a fresh mill that's ready for your choice of components to make it your own. ATK Chevy LQ4 6.0L 460 hp long block crate engines include: * Handpicked and seasoned 6-bolt main block * Aligned and honed main bores * OE steel crankshaft * 3.622 in. stroke * OE connecting rods * Hypereutectic dish top pistons * Aluminum cylinder heads * Hydraulic roller camshaft * Timing chain and gear set * 1.7:1 ratio rocker arms * 24-tooth reluctor
( 10 )
$5,049.99
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$7,898.99
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 base long block crate engine is fitted with AFR heads. 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 with trunnion upgrade * Oil pump: Melling M295
Not Yet Reviewed
$5,199.99
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$5,556.99
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
Not Yet Reviewed
$8,899.99
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
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