Valve Cover Gasket and Glow Plug Kit for Ford F-250 F-350 F-450 F-550 (1999-2003) 7.3L

Heavy-Duty Valve Cover Gasket and Glow Plug Kit for 1999-2003 Ford F-250, F-350, F-450, F-550 (Super Duty)

What it Does: The Valve Cover Gasket and Glow Plug Kit replaces degraded pass-through harnesses, brittle seals, and worn glow plugs on the 1999-2003 Ford F-250, F-350, F-450, and F-550 to eliminate oil contamination, resolve injector misfires, and restore reliable cold starts.

The Stock Ford F-250, F-350, F-450, F-550 Under-Valve-Cover Harness and Gasket Failure

The factory Under-Valve-Cover Harness (UVCH) and integral pass-through connectors on the 7.3L Powerstroke suffer severe degradation from continuous exposure to high engine oil temperatures and thermal cycling. Over time, the internal plastic clips fatigue, allowing the wiring pins to loosen and arc. This thermal fatigue melts the connector pins, creates intermittent open circuits to the HEUI injectors, and causes severe bank-specific misfires. Concurrently, factory glow plug heating elements wear out, developing high internal resistance or shorting, leading to hard cold starts, excessive white smoke, and unburned fuel washdown in cylinder bores.

The Engineering Solution

This comprehensive service kit replaces fatigued factory electronics with heat-stabilized, high-temp fluoropolymer insulation and heavy-duty molded female connector housings engineered to resist continuous oil immersion up to 300°F. The valve cover gaskets integrate reinforced pass-through terminals to prevent pin loosening and oil weeping, while the high-impedance F4TZ-12A342-BA replacement glow plugs utilize durable Inconel sheaths to endure high combustion pressures and prevent tip swelling. Replacing both banks alongside fresh main pigtails ensures proper voltage delivery across injector solenoids and restores factory glow plug preheat cycles.

What's Included

• 4 Fuel Injector Harnesses (UVCH)
• 4 Main Pigtails
• 2 Valve Cover Gaskets with Integrated Connectors
• 8 Glow Plugs

Technical Specifications

Compatibility

• 1999-2003 Ford F-250 Super Duty 7.3L Diesel
• 1999-2003 Ford F-350 Super Duty 7.3L Diesel
• 1999-2003 Ford F-450 Super Duty 7.3L Diesel
• 1999-2003 Ford F-550 Super Duty 7.3L Diesel

Frequently Asked Questions & Fitment Warnings

Does this fit the Super Duty F-250, F-350, F-450, F-550?

Yes, this is a direct fit for the 1999-2003 Ford F-250, F-350, F-450, and F-550 equipped with the 7.3L Powerstroke engine. Does not fit 2001 F-550 Super Duty Lariat Cab and Chassis Crew Cab models.

Do I need to replace both sides simultaneously?

Yes, replacing both valve cover gaskets and verifying injector and glow-plug pin seatings at the same time is strongly recommended to maintain balanced circuit resistance across both cylinder banks.

The Ford Heavy-Duty Reliability Caliber

Built for sustained heavy towing and high-mileage fleet durability, these upgraded UVCH harnesses and glow plugs ensure stable signal delivery and rapid combustion chamber ignition under extreme workload conditions.