Performance Oil Pump Timing Chain & Water Pump Kit for Chevrolet Silverado 1500 (1999-2004) 4.8L 5.3L 6.0L

High-Durability Engine Timing, Lubrication & Cooling Refresh Kit for 1999-2004 Chevrolet Silverado 1500 (GMT800)

What it Does: The Performance Oil Pump Timing Chain & Water Pump Kit restores critical lubrication, cam synchronization, and thermal cooling efficiency on the 1999-2004 Chevrolet Silverado 1500 to prevent valvetrain failure and engine overheating.

The Stock Chevrolet Silverado 1500 Oil Pressure Loss and Timing Deflection

Factory GMT800 trucks powered by the Gen III Vortec V8 platform frequently suffer from worn oil pump pressure relief valves that stick open, inducing severe low-pressure warnings at idle. Concurrently, high-mileage OEM timing chains stretch, creating camshaft timing retard and ignition jitter that sap low-end torque. Coupled with factory mechanical water pump bearing wash-out and weeping shaft seals, these simultaneous wear items leave the engine vulnerable to catastrophic valvetrain and bottom-end wear under heavy load.

The Engineering Solution

This front-dress refresh package eliminates factory failure points in a single service. The high-output gerotor oil pump provides consistent volumetric flow throughout the rev range via an engineered pressure relief mechanism. The matched timing set features hardened alloy sprockets and a pre-stretched chain to maintain tight cam-to-crank indexing. A high-efficiency cast-aluminum water pump delivers balanced coolant flow through the block, sealed by precision timing cover and water pump gaskets that resist thermal expansion fatigue.

What's Included

• 1 Oil Pump
• 1 Timing Chain Kit (Chain and Sprockets)
• 1 Timing Cover Gasket Set
• 1 Water Pump
• Assorted Seals and O-Rings

Technical Specifications

Compatibility

• 1999-2004 Chevrolet Silverado 1500 4.8L Vortec V8 (LR4)
• 1999-2004 Chevrolet Silverado 1500 5.3L Vortec V8 (LM7, L59)
• 1999-2004 Chevrolet Silverado 1500 6.0L Vortec V8 (LQ4, LQ9)

Frequently Asked Questions & Fitment Warnings

Does this fit the GMT800 Silverado 1500?

Yes, this is a direct fit for the 1999-2004 Chevrolet Silverado 1500 equipped with the 4.8L LR4, 5.3L LM7/L59, or 6.0L LQ4/LQ9 Gen III Vortec V8 engines.

Is it required to replace the pickup tube O-ring during installation?

Yes, using the supplied correct-spec oil pickup tube O-ring and ensuring a flush seat is mandatory to prevent aeration and loss of oil prime.

The Chevrolet Silverado Heavy-Duty Caliber

Built to handle rigorous towing and extreme thermal duty cycles, these upgraded components provide the mechanical longevity and pressure stability demanded by work-ready trucks.