JEGS
High-Performance LS Crate Engine Kit [GM LS 5.3L LM7 460 HP / 425 ft.-lbs. TQ]
059-5300K
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Items You Need
LS Crate Engine Kit
JEGS GM LS High-Performance Crate Engine Kit Includes:
- JEGS High-Performance Crate Engine GM LS 5.3L 460 HP / 425 ft.-lbs. TQ - 059-5300
- Holley Dual Plane Mid-Rise Intake Manifold - 510-300-130
- ICT Billet Valley Pan Cover Plate - 335-551629
- JEGS LS Timing Cover - 555-50320
- MSD Ignition Controller - 121-6014
- JEGS Retrofit Oil Pan - 555-50239
JEGS Performance 5.3L engine was designed to be a performance upgrade for 1999-2007 LM7 truck applications or LS swap vehicles. This engine has a noticeable idle and provides large power gains in the mid to upper RPM range. For optimal performance intake and headers recommended. An ECU tune and upgraded injectors are required.
- Horsepower: 460 HP
- Torque: 425 ft.-lbs.
Block Information:
- OE LM7/5.3L cast iron
- Bore/Stroke: 3.800 in. x 3.622 in.
- Displacement: 5.3L
Rotating Assembly:
- Crankshaft: OE GM 24-tooth reluctor wheel
- Rods: Stock GM
- Compression Ratio: 10.0:1
- Pistons: Hypereutectic
- Rings: Moly
- Internally balanced
Camshaft Specs:
- Camshaft: Hydraulic roller tappet
- Cam Duration @ .050 in.: Intake 222 / Exhaust 231
- Cam Lift: Intake .545 in. / Exhaust .545 in.
- Lobe Separation Angle: 112
Cylinder Head Information:
- Cylinder Heads: OE aluminum (Either 799 or 243 castings)
- Combustion Chamber: 64 cc
- Valve Size: 2.000 in. Intake / 1.550 in. Exhaust
- Rocker Arms: Powdered metal roller rockers 1.7 ratio with C-clip upgrade retainer
Recommended Components
- Balancer: Stock Internal Balance
- Flexplate/Flywheel: Stock Internal Balance
- Exhaust: Headers with 1 5/8 in. or 1 3/4 in. Primary Tubes
- Firing Order: Stock
- Fuel: 91-93 Octane
- Oil: 5W30
- Spark Plugs: Stock
- Spark Plug Gap: .035 in.
- Recommended Stall Converter: 2500
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 or break-in oil or conventional (non-synthetic) 10w30 oil with zinc additive for the first 500 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. It is best to avoid long periods of idling during this period. Check the engine oil and coolant levels daily.
Engines with flat tappet hydraulic cams only - Run the engine between 2,000 and 2,500 RPM's, with no-load on the engine for the first 30 minutes. Let the engine cool down completely and repeat the process 2-3 more times. Do not idle the engine for an extended period at this time, this is critical to break in the camshaft.
At 500 Miles change the engine oil and filter using conventional (non-synthetic) oil with a zinc additive. Check fuel and ignition settings, adjust valves (where applicable). Drive the next 500 miles normally, without high RPM's (below 5000 RPM), hard use, or extended periods of high loading or long periods of idling.
Change the oil and oil filter again at 1,000 miles. Continue using conventional (non-synthetic) oils and zinc additive, until about 4,000 miles. At that point, you may run a quality 10w30 synthetic oil if you choose. The use of oil with high zinc or a zinc additive for the life of your engine is recommended.
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.