Ignition Coil + Iridium Spark Plugs for Ford F-250 (2008-2009) 6.8L

Direct-Replacement Ignition Coil & Iridium Spark Plug Kit for 2008-2009 Ford F-250

What it Does: The ignition coil and iridium spark plug kit replaces aged factory secondary ignition components on the 2008-2009 Ford F-250 6.8L to eliminate high-load misfires and restore combustion efficiency.

The Stock Ford F-250 Thermal Breakdown and Voltage Leakage

The 6.8L Triton V10 operates with high thermal loads inside deeply recessed spark plug wells. Over continuous thermal cycling, factory coil-on-plug (COP) epoxy housings develop micro-fractures, while the boots harden and oxidize. This allows secondary voltage to arc directly to the cylinder head rather than across the plug gap—especially under open-throttle towing when cylinder pressures peak. Concurrently, factory plugs experience ground electrode erosion, widening the gap and escalating the kilovolt demand past what degraded stock coils can reliably discharge.

The Engineering Solution

This comprehensive service kit replaces all 10 cylinders with heavy-duty coil packs and fine-wire iridium plugs. The ignition coils utilize high-dielectric epoxy potting and premium magnetic silicon steel cores to maximize primary-to-secondary energy transfer without thermal breakdown. Reinforced high-temp silicone boots with internal stainless steel springs prevent dielectric punch-through and flashover. The matched fine-wire iridium spark plugs feature laser-welded tips that lower ionization voltage requirements, reduce quench, and resist erosion during high-load, sustained duty cycles.

Technical Specifications

Compatibility

• 2008 Ford F-250 Super Duty 6.8L V10 Triton 3-Valve
• 2009 Ford F-250 Super Duty 6.8L V10 Triton 3-Valve

Frequently Asked Questions

Does this fit the P356 F-250?
Yes, this is a direct fit for the 2008-2009 Ford F-250 equipped with the 6.8L Triton V10 3-valve engine.

Are these configured for the brown-boot design used on late 3-valve heads?
Yes, these units feature the revised boot length and angle matching 8L3Z-12029-A specifications for post-mid-2008 revised head castings.

The Ford Super Duty Towing Standard

When hauling maximum payload or towing heavy trailers, steady spark delivery is mandatory to keep exhaust gas temperatures controlled and maintain torque across the rev range. This kit provides factory-spec fitment and robust heat resistance designed for severe heavy-truck operating environments.