ATK Engines High Performance Crate Engine GM LS 408ci 600HP / 550TQ
059-LS01
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Base Engine
ATK Core Return Process
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NOTE: Core return can be any Chevy LS 6.0L engine
Engine Specifications
This is an LQ4/408ci stroker based engine with LS3 aluminum heads making a power house with 600hp. Expect great top end power, power brakes may not work due to minimal vacuum.
- Horsepower: 600 hp
- Torque: 550 lb/ft
Block Information:
- OE LQ4/6.0L iron
- Bore/Stroke: 4.030" x 4.000"
- Displacement: 408ci
Rotating Assembly:
- Crankshaft: Manley 4340 forged 24 tooth reluctor wheel
- Rods: Manley 4340 forged H beam with ARP 8740 bolts
- Compression Ratio: 10.3:1
- Pistons: Manley 2618 forged
- Rings: Moly
Camshaft Specs:
- Camshaft: Hydraulic roller
- Cam Duration @ .050": Intake 240 / Exhaust 256
- Cam Lift: Intake .625" / Exhaust .625"
- Lobe Separation Angle: 113lsa
- Lifters: GM LS7
- Timing Chain: Billet HD .250" roller
Cylinder Head Information:
- Cylinder Heads: GM LS3 aluminum rectangle port
- Combustion Chamber Size: 68.4cc
- Intake Runner Size: 260cc
- Valve Size: 2.165" Intake / 1.590" Exhaust
- Rocker Arms: OE 1.7 ratio with bushing upgrade
Engine Info
- Exhaust: 1-3/4" Headers
- Firing Order: 18726543
- Octane: 91+
- Oil: 10W40
- Oil Filter: Wix or K&N
- Spark Plug Gap: .040"
- Stall Converter: 3000+
Recommended Components
- Balancer: Stock internal balance/per application
- Carburetor: Quick Fuel 850cfm mechanical secondary's #793-Q-850
- Intake Manifold: Edelbrock Victor Jr. #350-28457
- Flexplate/Flywheel: Stock internal balance
- Fuel Pump: Electric
- Oil Pump: Melling standard volume, high pressure
- Spark Plugs: Autolite #417-104
- Spark Plug Wires: MSD #121-5574
- Timing Control: MSD #121-6014 with baseline of 10deg @0rpm, 20deg @ 500 rpm, 26deg @ 1500rpm, and 31deg at 2500-6500rpm
- Water Pump: Per application
Notes: A PCV valve must be ran; follow valve cover instructions provided. You must run an air-oil separator system such as Moroso #710-85487 to capture the excess crankcase vapors LS engines are known for. If you are not running a MAP sensor, the MAP timing option in the timing control box must be zeroed out all the across. Failure to do so will allow the controller to add timing which can lead to detonation. You must also run some sort of a steam line kit that dumps to your water pump, radiator, or radiator hose (4 corner setup recommended). This allows air pockets/hot spots to escape the heads and can also be used to purge out trapped air when filling the radiator for the first time.
Disclaimer: Power figures can vary based on parts used by the end user. Some modifications to the vehicle may be required using these and or other aftermarket parts.
Engine Break-In Procedure
Use conventional or break-in oil (non-synthetic) for the first 600 miles of operation. Do not drive for long periods at any single speed, always vary your speed. Do not tow a trailer or put other heavy loads on the vehicle. Check the engine oil and coolant levels daily.
At 600 Miles change the engine oil and filter using conventional (non-synthetic) oil. Check fuel and ignition settings; adjust valves (where applicable).
After the first 5,000 of service synthetic engine oil may be used. Follow your vehicle owner’s manual for service intervals.
Specifications:
Motor Vehicles
WARNING: Motor vehicles contain fuel, oils and fluids, battery posts, terminals and related accessories which contain lead and lead compounds and other chemicals known to the State of California to cause cancer, birth defects and other reproductive harm. These chemicals are found in vehicles, vehicle parts and accessories, both new and as replacements. When being serviced, these vehicles generate used oil, waste fluids, grease, fumes and particulates, all known to the State of California to cause cancer, birth defects, and reproductive harm.
Tools:
WARNING: Some dust created by power sanding, sawing, grinding, drilling, and other construction activities contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Some examples of these chemicals are: lead from lead-based paints, crystalline silica from bricks and cement and other masonry products, and arsenic and chromium from chemically treated lumber. Your risk from exposure to these chemicals varies, depending on how often you do this type of work. To reduce your exposure, work in a well-ventilated area and with approved safety equipment, such as dust masks that are specially designed to filter out microscopic particles.
Electrical Cords
WARNING: The wires of these products contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Wash hands after handling.