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High-performance Chevy LS 5.3L 450 horsepower crate engine by Summit Racing
  • High-performance Chevy LS 5.3L 450 horsepower crate engine by Summit Racing
  • High-performance Chevy LS 5.3L 450 horsepower crate engine by Summit Racing
  • High-performance Chevy LS 5.3L 450 horsepower crate engine by Summit Racing
  • High-performance Chevy LS 5.3L 450 horsepower crate engine by Summit Racing
  • High-performance Chevy LS 5.3L 450 horsepower crate engine by Summit Racing
  • High-performance Chevy LS 5.3L 450 horsepower crate engine by Summit Racing
  • High-performance Chevy LS 5.3L 450 horsepower crate engine by Summit Racing
  • High-performance Chevy LS 5.3L 450 horsepower crate engine by Summit Racing
  • High-performance Chevy LS 5.3L 450 horsepower crate engine by Summit Racing
  • High-performance Chevy LS 5.3L 450 horsepower crate engine by Summit Racing
  • High-performance Chevy LS 5.3L 450 horsepower crate engine by Summit Racing
  • High-performance Chevy LS 5.3L 450 horsepower crate engine by Summit Racing
  • High-performance Chevy LS 5.3L 450 horsepower crate engine by Summit Racing
  • High-performance Chevy LS 5.3L 450 horsepower crate engine by Summit Racing
Summit Racing™ Chevy LS 5.3L 450HP Long Block Crate Engines SUM-150153

Summit Racing™ Chevy LS 5.3L 450HP Long Block Crate Engines SUM-150153

$3,849.99 USD

Looking for big LS engine power at an affordable price? Summit Racing™ remanufactured 5.3L LS long block crate engines are rated at 450 HP and 420 lbs.-ft. torque! This engine will give you the performance and drivability you have been searching for at a price you can afford. It can be a performance upgrade for 99-07 Chevy trucks, or an engine swap into your project vehicle. You will save time and money by leaving the machine-work and assembly to us. Just bolt on your accessories and drop it in. These engines are machined and assembled for us by the guys at ATK, and backed with a 2-year unlimited mile warranty for peace of mind.

Technical Specifications:

  • Horsepower: 450+
  • Torque: 420+
  • Block: Seasoned OE LM7/5.3L iron
  • Bore/stroke: 3.800-3.820 in. x 3.622 in.
  • Year range: 1999-2007
  • Displacement: 323 C.I.D.
  • Crankshaft: OEM GM 3.622 in. stroke internally balanced 24-tooth reluctor wheel
  • Connecting Rods: OE GM forged powder metal 6.093 in.
  • Pistons: Hypereutectic flat top
  • Piston rings: Moly
  • Compression ratio: 10:1 compression
  • Camshaft: Summit Racing Pro LS Roller
  • Camshaft specifications: Lift- 550/550, Duration @.050- 222/232
  • Camshaft bearings: Installed and clocked to OEM position
  • Cylinder heads: #799 or #243 OE aluminum 64cc 2.00 in./1.55 in. valves
  • Freeze plugs: Brass installed and sealed
  • Rocker arms: OE powdered metal 1.7 ratio
  • Oil Galley plugs: Installed and sealed