Splitfire SF-406S Spark Plug – New Surplus V-Electrode High Performance Plug

Splitfire SF‑406S Spark Plug – New/Clean Surplus V‑Electrode Performance Plug

Short Description: Splitfire SF‑406S spark plug features patented V‑notch ground electrode for enhanced combustion efficiency—clean surplus condition, ideal for performance tuning.

• Splitfire V‑notch electrode design promotes wider flame kernel and faster combustion
• Copper‑cored center electrode ensures optimal spark energy and heat conduction
• Precision‑machined metal shell resists cylinder‑head seizing
• Clean surplus or new condition—offers reliable ignition at a value price
• Common cross‑reference to Denso IW24 / SF406C applications (verify fitment)

The Splitfire SF‑406S (akin to SF‑406C / IW24) is a high‑performance spark plug engineered for responsive ignition and clean combustion. With its distinctive V‑notch ground electrode, this plug enables the flame front to bypass the traditional side grounded surface and expand evenly—enhancing combustion speed and efficiency. The copper‑cored center electrode delivers robust spark energy and improved thermal conductivity, while the fine‑tuned metal shell ensures durability in threaded installation areas. Offered in new or clean surplus condition, the SF‑406S sets provide dependable performance as cost‑effective ignition upgrades. Compatible with a wide range of engines—especially those originally specified with SF‑406C or Denso IW‑series plugs—ensure correct selection before installation by cross-referencing fitment guides.

Technical Specifications:

• Part Number: SF‑406S (equivalent to SF‑406C / Denso IW24)
• Condition: New or clean surplus
• Core Material: Copper‑center electrode
• Electrode Design: Patented V‑notch side electrode
• Shell Construction: Precision‑machined metal, 14 mm thread (commonly)
• Intended Use: High‑performance ignition, classic and vintage auto/motorcycle engines