Items You Need
LS Gen III/IV
ATK Core Return Process
JEGS and ATK appreciate your business and want to ensure that your core return is as smooth as possible.
Please CLICK HERE for ATK Core Return Process
NOTE:
- Core return can be any Chevy LS 6.0L engine
This short block is built for engines that are going to be running boost or nitrous. It has upgraded ARP main studs, rod bolts, and Total Seal piston ring package gapped accordingly for 10+ PSI.
Block Information:
- Seasoned OE 2001-2007 GM Cast Iron LQ4 6.0L with ARP main studs
- Bore/Stroke: 4.030" x 4.000"
- Displacement: 408ci
- Camshaft Bearings: Installed and clocked to OEM position
- Freeze Plugs: Installed and sealed
- Oil Galley Plugs: Installed and sealed
Rotating Assembly:
- Crankshaft: Manley 4340 forged 24-tooth reluctor wheel
- Rods: Manley 4340 forged H beam rods with ARP 2000 bolts
- Compression Ratio: 64cc= 11.9:1 68cc= 11.4:1 / 72cc= 11.0:1
- Pistons: Manley 2618 flat top +4cc
- Rings: Total Seal CS AP with steel top rings gapped for boost/nitrous
Recommended Components:
- Balancer: Internal balance
- Flexplate/Flywheel: Internal balance
- Head Gasket: .051" thickness or per application
- Oil: 10W40 Non synthetic for first 3000 miles
- Oil Filter: Wix or K&N per application
- Oil Pump: Melling #689-10295 with high pressure spring
Notes:
ATK's Boost/Nitrous short blocks are meant for engines running these setups. Bearing clearances and ring gap have been taken into consideration for this series of short blocks.
Emissions Note:
This part is only legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles or on vehicles used solely for the purposes of closed competition racing.
CLICK THIS LINK FOR IMPORTANT CARB & EPA EMISSIONS INFORMATION ABOUT THIS PART
Specifications:
How much Boost can it hold?
Will there be any issues running this in an N/A condition? I am considering this short block over the same non-nitrous/boost ready one (SP-39) due to this one having ARP mains already installed. No plans for nitrous or boost.
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.