Items You Need
Engine Specifications
This is an LM7-based engine with CNC ported cathedral port aluminum heads making a very street-able 540hp. Expect big mid to upper power, which will have a noticeable idle. For optimal performance, you will need headers, chassis dyno tune, and upgraded injectors.
- Horsepower: 540 hp
- Torque: 505 lb/ft
Block Information:
- OE LM7/5.3L iron
- Bore/Stroke: 3.903" x 4.000"
- Displacement: 383ci
Rotating Assembly:
- Crankshaft: K1 4340 forged 24 tooth reluctor wheel
- Rods: K1 4340 forged I beam 6.125" with ARP 8740 bolts
- Compression Ratio: 10.6:1
- Pistons: Wiseco forged
- Rings: Moly
Camshaft Specs:
- Camshaft: Hydraulic roller
- Cam Duration @ .050": Intake 228 / Exhaust 234
- Cam Lift: Intake .604" / Exhaust .609"
- Lobe Separation Angle: 112lsa
Cylinder Head Information:
- Cylinder Heads: OE aluminum CNC ported cathedral port, dual valve springs, and titanium retainers
- Valve Size: 2.02" Intake / 1.60" Exhaust
- Rocker Arms: OE 1.7 ratio
- Timing Chain: Billet HD .250" roller
Oil Pump Information:
- Oil Pump: Melling
Base Engine Includes:
- Short Block
- Camshaft
- Timing Set
- Cylinder Heads
- Oil Pump
Recommended Components
- Balancer: Stock internal balance/per application
- Intake Manifold: Stock EFI, aftermarket EFI, or carbureted intake
- Flexplate/Flywheel: Stock internal balance
- Fuel Pump: Electric per application
- Fuel Injectors: 36lb injectors
- Spark Plugs: NGK #739-TR5GP
- Spark Plug Wires: Factory
- Water Pump: Per application
Notes: This engine can replace the 1999-2007 Chevy 5.3L LM7 engine with supporting modifications or any other factory LS equipped vehicle. It can also be retrofitted for an aftermarket EFI/Carb setup. ECM must be tuned, not doing so can damage the engine.
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
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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.