Chevy 4.8L LS V8 Remanufactured Engine – 1999-2007

Description

Harness 285 horsepower and 4.8 liters of dyno-verified displacement while holding engine coolant temperatures below 200°F across grueling regional cross-state freight transit corridors inside this Chevy 4.8L LS Remanufactured Engine. Engineered for 1999 to 2007 commercial chassis, this LR4 iron block platform integrates cross-bolted main bearing caps with hydraulic roller camshaft durability for sustained fleet uptime.

Cast from high-nickel gray iron, this deep-skirt block features six-bolt main bearing caps and an Ra 28 micro-inch deck surface finish. A precision-ground nodular iron crankshaft rotates within line-honed journals, driving forged powdered metal connecting rods and hypereutectic pistons. Bores receive diamond plateau honing for oil film retention under load. Total dry weight stands at 440 lbs with a six-quart crankcase capacity.

Key Features of Chevy 4.8L

Fleet maintenance supervisors buy Chevy 4.8L remanufactured engine packages to maximize vehicle uptime across demanding municipal utility fleets. Every production unit undergoes automated hot-run testing to verify bearing clearances and dynamic oil pressure integrity under severe load.

• Six-bolt cross-bolted main caps eliminate crankshaft flex during continuous maximum torque production.
• Cathedral port aluminum cylinder heads optimize air-fuel mixing to deliver high combustion efficiency.
• Diamond plateau cylinder honing provides rapid moly ring seat without cylinder bore burnishing.
• Multi-layer steel cylinder head gaskets withstand 185 PSI dynamic combustion strokes without failure.
• Chevy 4.8L internal gerotor oil pump sustains 55 PSI pressure through overhead valve trains.
• Fluoroelastomer valve stem seals eliminate oil migration into combustion chambers during idle.
• Hardened powder-metal valve seats resist recession under high exhaust gas heat conditions.
• Hydraulic roller lifters maintain constant valve clearance without manual mechanical adjustment.

Gen III Continuous Horsepower Metrics

Operating parameters require 22 PSI hot idle pressure and 50 to 60 PSI hot cruise pressure under load. Operating thermostat regulation maintains coolant heat between 190°F and 205°F during vocational service cycles. Dyno-verified output reaches 285 continuous horsepower at 5,200 RPM and 295 lb-ft torque at 4,000 RPM. A 9.5:1 compression ratio operates within 180 to 190 PSI cylinder pressure thresholds. Radiator circuits reject 4,100 BTU/min heat during severe commercial fleet operations across regional freight corridors.

Gen III Crankshaft Driveline Coupling Specs

The one-piece rear main crankshaft flange carries a 6-bolt flywheel bolt pattern with a 2.500-inch pilot diameter for standard curved flexplates. Crankshaft snout measures 1.259 inches with standard keyways for dynamic balancer installation. Crankshaft endplay checks out between 0.003 and 0.007 inches using precision dial indicators. Torque converter pilot bore centers commercial 4L60E and 4L80E automatic transmission input shafts without friction.

Cathedral Port Engine Priming Guidelines

Pressure prime all internal oil galleries with approved 5W-30 engine oil before initial crankcase ignition. Ensure the cooling system is vacuum bled to avoid air locks inside the cylinder head water jackets. Not engineered for high-boost turbocharger conversions exceeding 6 PSI, marine salt water use, or vehicles exceeding 12,000 lbs gross vehicle weight.

• Inspect external engine oil lines and fluid levels each shift.
• Check accessory drive belt alignment and tension every 50 operating hours.
• Replace crankcase motor oil and spin-on lubricant filter every 4,000 miles.

Commercial Fleet Warranty Crate Hardware Manifest

Supplied with an industry-grade 3-Year / 100,000-Mile commercial fleet warranty covering parts and block casting integrity. The heavy-duty shipping crate contains the remanufactured long block engine, high-volume oil pump, oil pump pickup screen, complete install gasket package, pre-lubrication instructions, and certified quality audit dyno sheets.