This is a PERFORMANCE HEAVY DUTY Spark Plug and Ignition Coil set for the Ford DOHC (double over head cam) Boss Motors with the 260 and 290 version engines. Does not suit the single overhead cam engine. SOHC).

Iridium IX 
Designed specifically for the performance enthusiast. Iridium IX® offers extreme ignitability, improved throttle response and superior anti foulingFine Iridium tip ensures high durability and a consistently stable spark Iridium alloy has extremely high melting point, perfect for today’s high-tech, high-performance engines Trivalent Metal Plating - superior anti-corrosion and anti-seizing properties Tapered ground electrode minimizes quenchingOutstanding acceleration, high fuel efficiency and durability Ultimate design, technology and performance.

PLEASE NOTE! 

On the BA 260, these are the later, shorter style plugs, we do have the older longer style in stock usually as well, message if you need them. Correct gap for the BA-BF-FG motors 5.4l V8