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ATK HP97 Chevy LM7 5.3L 99-07 Truck Base Engine 385HP

ATK HP97 Chevy LM7 5.3L 99-07 Truck Base Engine 385HP

Item #31974 Brand: ATK Engines

HP97 ATK Chevrolet 5.3 H.P. 385HP Engine Long Block
Quantity: close
Only $3,098.99
This item ships directly from the manufacturer and is not available for store pickup. Some engines are made to order or can be backordered. Delivery can be delayed for 4-5 weeks but usually ship within 3 days.

Orders placed for this item cannot be canceled or changed.


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ATK HP97 Chevy LM7 5.3L Base Engine, or Stage 1 Engine, is designed for those that may have their own component parts already and who also are interested in completing out the build themselves. A GM base engine typically consists of the following: Short Block, Camshaft, Timing set, Cylinder heads, Valve covers, Timing cover, oil pan, oil pump & pick up tube.

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
  • Rocker Arms: OE powdered metal 1.7 ratio
  • 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.

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    ATK HP97 Chevy LM7 5.3L 99-07 Truck Base Engine 385HP


    • Horsepower: 385+
    • Torque: 390+
    • Block: GM 5.3L Iron LM7
    • Bore/Stroke: Up to 3.809 x 3.622
    • Year Range: 1999-2007
    • Displacement: 323 C.I.D.
    • Crankshaft: OEM GM 3.622" Stroke Internally Balanced 24 tooth Reluctor wheel .857" Flange
    • Connecting Rods: OE GM Forged Powder Metal 6.093" Stock Bolts
    • Pistons: Hypereutectic Dish
    • Piston Rings: Moly Rings
    • Compression Ratio: 9.5:1 Compression
    • Camshaft: Hydraulic Roller
    • Camshaft Specifications: Custom Grind
    • Camshaft Bearings: Installed & Clocked to OEM Position
    • Cylinder Heads: OE Aluminum 61.15cc 1.89/1.55
    • Freeze Plugs: Brass Installed & Sealed
    • Rocker Arms: OE Powdered Metal 1.7 Ratio
    • Oil Galley Plugs: Installed & Sealed
    • Weight: 385


    2 Year Manufacturer Warranty


    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

    Shipping Instructions and Core Information

    Shipping is free and lift gate will be provided.

    There is no core charge for this engine. You will not be required to send a core back to the manufacturer.

    Eastwood Offers Free Lifetime Technical Support

    Click here for product SDS information

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    Proposition 65 Warning WARNING - Cancer and Reproductive Harm -

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