25317628 Fuel Injectors for Chevy Silverado GMC 4.8L 5.3L 6.0L 99 06 8 Piece

Product Overview

These high-flow fuel injectors restore proper fuel atomization and delivery for 1999–2006 GM Vortec 4.8L, 5.3L, and 6.0L engines. Designed as a direct OEM replacement with improved metering, they help eliminate rough idle, hesitation, and misfires. Ideal for do-it-yourself mechanics and professional shops servicing Chevy Silverado and GMC Sierra trucks.

Key Features & Performance

• Set of 8 direct-fit fuel injectors with exact OEM-style connector and flow-matched within tight tolerances.
• Improved multi-hole nozzle design enhances fuel atomization for more complete combustion and better throttle response.
• Corrosion-resistant stainless steel body and durable internal coils ensure long service life and resistance to ethanol-blended fuels.
• Pre-installed upper and lower O-rings simplify installation—no extra seals required.
• Each injector is 100% flow-tested and leak-tested to guarantee consistent fuel delivery across all cylinders.

Fitment & Compatibility

• 1999–2006 Chevrolet Silverado 1500 / 2500 / 3500 with 4.8L, 5.3L, or 6.0L V8 (Vortec)
• 1999–2006 GMC Sierra 1500 / 2500 / 3500 with 4.8L, 5.3L, or 6.0L V8 (Vortec)
• 1999–2006 Chevrolet Tahoe / Suburban / Avalanche with 4.8L, 5.3L, 6.0L
• 1999–2006 GMC Yukon / Yukon XL with 4.8L, 5.3L, 6.0L
• 1999–2006 Cadillac Escalade with 5.3L or 6.0L
• Also fits select Chevrolet Express, GMC Savana, and Hummer H2 with compatible Vortec V8 engines

Common Uses

• Replacing original fuel injectors that are clogged, leaking, or causing misfire/lean codes on high-mileage 4.8L, 5.3L, 6.0L Vortec engines.
• Restoring proper fuel delivery when addressing rough idle, hesitation on acceleration, or decreased fuel economy.
• Supporting mild performance tunes or basic bolt-on intake/exhaust modifications while retaining stock fuel rail pressure.
• Factory-style replacement during intake manifold gasket service or full upper-engine refresh.

Technical Specifications

• Part Number(s): 25317628
• Fuel Type: Gasoline (ethanol-blend compatible up to E10)
• Injector Design: Multec-type with multi-hole nozzle
• Coil Resistance: High-impedance (approx. 12–16 ohms)
• Connector Type: USCAR / EV6 style (OEM plug-and-play)
• O-ring Material: Viton®
• Flow Rate @ 43.5 psi: Approx. 24 lb/hr

Frequently Asked Questions

Q: Will these injectors fit a 2003 Chevy Silverado 1500 with the 5.3L Vortec engine? A: Yes, this 8-piece set is a direct fit for 1999–2006 Silverado/Sierra models with 4.8L, 5.3L, and 6.0L engines, including the 2003 5.3L. Ensure your OEM part number is 25317628 to confirm.

Q: Do I need to reprogram the ECU after installing these fuel injectors? A: No reprogramming is required for a stock replacement. These injectors match the factory flow rate and impedance, so they work with the original engine calibration.

Product appearance and specifications may vary slightly by batch. Compatibility may vary by serial number. Verify fitment before purchase.