ATK HP97 Chevy LM7 5.3L 99-07 Truck Base Engine 385HP
$4,145.00
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Lead Time: Estimated: 4 - 6 weeks
Description
Description
This engine was designed to be a performance upgrade for a 1999-2007 Chevy Truck LM7 or LS swap in a hot rod. Expect big mid to upper end power, will have a noticeable idle. For optimal Performance you will need headers, chassis dyno tune and upgraded injectors. Cam Specs will come with the engine.
Engine Specifications:
• HP: 385
• TQ: 390
• Block: Seasoned OE LM7/5.3L iron
• Bore/Stroke: Up to 3.809 x 3.622
• Displacement (cu.in): 323
• Crankshaft: OEM GM 24 tooth reluctor wheel
• Rods: Stock GM
• Pistons: Hypereutectic 9.5:1 compression
• Rings: Moly
• Camshaft: Hyd. roller
• Cam Specs: Custom performance grind
• Cylinder Heads: OE aluminum 61.15cc 1.89”/1.55” valves
• Rocker Arms: OE powdered metal 1.7 ratio
Recommended Components:
• Oil- 5W30
• Fuel System – OE EFI System
• Intake – Stock Fuel Injected
• Balancer- Stock Internally Balanced
• Flex plate/Flywheel- Stock Internally Balanced
• Spark Plug- Stock
• Spark Plug Gap- .035”
• Timing- Set To Factory Specifications Via PCM Module (Tune Required)
• Firing Order- Stock
• Fuel – 91 Octane
• Recommended Stall Converter- stock or 1800
• Exhaust- 1 5/8 or 1 3/4 Headers
Notes: This engine was designed to be a performance upgrade for a 1999-2007 Chevy Truck LM7 or LS swap in a hot rod. Expect big mid to upper end power, will have a noticeable idle. For optimal Performance you will need headers, chassis dyno tune (required) and upgraded injectors. Cam Specs will come with the engine.
Disclaimer: The parts listed are ATK’s recommendations of parts to be used to obtain our power figures listed. Power figures can vary based on parts used by the end user. It is the customer’s responsibility to verify components will work in their application. Some modifications to the vehicle may be required using these and or other aftermarket parts. ATK reserves the right to substitute parts used in engines if necessary.
Don Healey –
I like to update my experience with this engine from time to time. This is my third update.. I installed this engine in my 2005 Silverado z71 in 2018 following the break in procedure provided with the engine. I now have put over 60,000 mi on it without a single problem and believe me when I say I’ve used it hard at times. Towing a dual axle enclosed motorcycle trailer, a 2000lb 21’ sailboat or a 3500lb camper quite often. From nc I’ve made trips to ariz, ny, Fla. I did install a hd aluminum radiator other than that the truck is completely stock, with 336,000 mi. From my experience I’ll would feel very confident buying another engine from this company.