SYKRSS Ignition Coil and Spark Plug Kit for Ford 5.4L/4.6L V8 — 8 DG508-Style Coils + 8 P479 Iridium Plugs, Pre-Gapped

Complete 8-coil and 8-spark-plug replacement kit engineered to restore ignition reliability for Ford 5.4L and 4.6L V8 engines.

If your Ford F-150, E-Series, Mustang, Crown Victoria, Lincoln Town Car, Mercury Grand Marquis or similar V8 is showing misfires, rough idle or reduced throttle response, this SYKRSS kit supplies all eight ignition coils (DG508-compatible) and eight pre-gapped P479 iridium spark plugs to replace the entire ignition bank in one service. The set is built to the correct OEM fitment and upgraded internally for greater heat, vibration and longevity performance compared with many aftermarket alternatives.

Will these coils and plugs fit my Ford 5.4L or 4.6L V8?

Yes — the kit is designed as a direct-fit replacement for a wide range of Ford modular V8 applications without splicing or modification. It replaces common OE part numbers (DG508, 1L2Z12029AA, F7TU12A366AB and others) and matches factory mounting and electrical connectors.

• Covers Ford trucks, vans and SUVs with 5.4L/4.6L V8 engines (F-150, F-250, F-350, E-Series, Expedition, Explorer, Mustang, Crown Victoria).
• Also fits Lincoln Town Car, Mercury Grand Marquis and Mountaineer and VPG MV-1 applications.
• Pre-gapped spark plugs at 0.054" for immediate installation.
• We verify fitment: supply VIN or Year/Make/Model for a double-check before you install.

How do these parts handle heat, vibration and harsh driving conditions?

SYKRSS coils are upgraded internally for durability: windings use high-grade enameled copper and coils are potted in durable epoxy to resist under-hood stresses. Silicone boots and high-temp materials reduce failure from heat cycles and mechanical shock, helping the ignition system survive extended heavy towing or extreme climates.

• German-imported enameled copper wire for durable windings.
• Japanese epoxy potting to resist vibration and moisture intrusion.
• Silicone boots rated for peak under-hood temperatures to prevent cracking.
• Tested across wide temperature ranges for reliability in cold and heat.

Why choose iridium spark plugs (P479) with these coils?

The P479 iridium plugs produce a concentrated spark with a fine electrode for more consistent ignition and longer service life than conventional plugs. Their ceramic insulator design reduces carbon tracking and helps maintain stable performance, which can lower misfire rates and preserve combustion efficiency across many miles.

• Ultra-fine iridium tip for focused, reliable spark under load.
• Isostatic ceramic insulator to limit flashover and fouling.
• Rated for extended service life—designed for 60,000+ miles in typical use.
• Pre-gapped to factory spec to avoid extra prep during install.

What installation steps and precautions should I follow?

Installation is straightforward for a DIY mechanic or professional shop, but Ford modular heads use shallow aluminum spark plug threads that are vulnerable to over-torque. Use a torque wrench and tighten spark plugs to the manufacturer-recommended 25–30 N·m (about 22 ft-lbs) to avoid thread damage; replace all eight coils at once for consistent performance across cylinders.

• Replace all 8 coils and 8 plugs together to stop intermittent misfires.
• Tighten spark plugs to exactly 25–30 N·m (22 ft-lbs) to prevent stripped threads.
• No splicing or cutting required — direct-fit electrical connectors match OE harnesses.
• If uncertain, send VIN or Year/Make/Model for SYKRSS fitment confirmation before install.

Who this kit is for: technicians, fleet managers and hands-on owners who want a full ignition-bank refresh for Ford 5.4L and 4.6L V8 vehicles. It’s ideal for trucks and vans that have spent many miles on original coils, vehicles experiencing misfires, or owners preparing a tow-heavy season. The kit pairs OEM-correct fit with internal upgrades and a one-year replacement promise, so you can replace all ignition components confidently and get back on the road with more consistent performance.