Chevy LM7 5.3L 1999-2007 Truck Base Engine 385HP

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. Horsepower: 385+Torque: 390+Block: GM 5.3L Iron LM7Bore/Stroke: Up to 3.809 x 3.622Year Range: 1999-2007Displacement: 323 C.I.D.Crankshaft: OEM GM 3.622" Stroke Internally Balanced 24 tooth Reluctor wheel .857" FlangeConnecting Rods: OE GM Forged Powder Metal 6.093" Stock BoltsPistons: Hypereutectic DishPiston Rings: Moly RingsCompression Ratio: 9.5:1 CompressionCamshaft: Hydraulic RollerCamshaft Specifications: Custom GrindCamshaft Bearings: Installed & Clocked to OEM PositionCylinder Heads: OE Aluminum 61.15cc 1.89/1.55Freeze Plugs: Brass Installed & SealedRocker Arms: OE Powdered Metal 1.7 RatioOil Galley Plugs: Installed & SealedWeight:385   Recommended Accessories: Oil