LS 5.3L Crate Engine
- Exhaust: 1-5/8" or 1-3/4" Headers
- Firing Order: 18726543
- Octane: 91+
- Oil: 5W30
- Oil Filter: Wix or K&N
- Spark Plug Gap: .035"
- Stall Converter: Stock or 1800
- Timing: Set to factory specifications via PCM module (Tune Required)
- Balancer: Stock internal balance/per application
- Intake Manifold: Stock EFI intake
- Flexplate/Flywheel: Stock internal balance
- Fuel System: OE EFI System
- Spark Plugs: Stock
- Spark Plug Wires: Factory
- Water Pump: Per application
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 process 2-3 more times. Do not idle the engine for any 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. Use of oil with zinc or a zinc additive for the life of your engine is recommended.
High-Performance Replacement Engine for LS-Based Trucks, Vans & SUV's
In 2007, ATK launched a High-Performance Division with one of the finest engine shops in the country. By reverse engineering all of their engines, they are able to eliminate any OEM deficiencies. This makes an ATK built crate engine have a superior design over the original engine by incorporating better components when needed. These quality built engines are offered in three different stages for ease of finishing an engine swap. ATK HP engines feature a 24 month/unlimited mile warranty.
This engine was designed to be a performance upgrade for LS based vehicles or perfect for a swap in a hot rod. For optimal performance you will need headers, chassis dyno tune, and upgraded injectors.
- Horsepower: 385 hp
- Torque: 390 lb/ft
- OE LM7/5.3L iron
- Bore/Stroke: 3.809" x 3.622"
- Displacement: 5.3L
- Crankshaft: OE GM 24 tooth reluctor wheel
- Rods: Stock GM
- Compression Ratio: 9.5:1
- Pistons: Hypereutectic
- Rings: Moly
- Camshaft: Hydraulic roller
- Cam Specs: Custom performance grind
Cylinder Head Information:
- Cylinder Heads: OE aluminum
- Combustion Chamber: 61.15cc
- Valve Size: 1.89" Intake / 1.55" Exhaust
- Rocker Arms: OE roller rockers 1.7 ratio
Oil Pump Information:
- Oil Pump: Melling standard volume
Base Engine Includes:
- Short Block
- Timing Set
- Cylinder Heads
- Oil Pump
So with a truck without AFM like on my 2002 avalanche, theres no way i can start the engine without computer tuned?
Can this engine be used in a 1979 el camino
can this be placed in a 1979 chevy el camino
Some other LM7 5.3 crate engines that are offered, indicate 2WD or 4WD applications. Why would that differ? Does this engine work in a 4WD application?
What gives this motor more horse power than the stock 5.3? Does it just have a cam in it or head work and other stuff?
Can this engine be used to replace a 2007 avalanche 5.3 with AFM? Would all I need to do is an AFM delete tune to delete this and make this engine work in this application? All other sensors of existing engine work in this application?
Was the motor dyno'd with aftermarket headers at 385HP, or should someone expect a increase with the headers?
so the HP requires aftermarket tuneable ecu?
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