Description

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

Looking for impressive LS engine performance at a budget-friendly price? Summit Racing™ remanufactured 5.3L LS long block crate engines deliver 450+ horsepower and 420+ lbs.-ft. of torque! This engine offers the power and drivability you want at a price that fits your budget. It’s a great performance upgrade for 1999-2007 Chevy trucks or a perfect option for an engine swap into your project vehicle. Skip the hassle of machine work and assembly—just bolt on your accessories and drop it in. These engines are machined and assembled by ATK, and they come with a 2-year unlimited mileage warranty for added 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
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