Bosch 7404 Copper Nickel Spark Plug with Multi-Ground Electrode

The Bosch 7404 (FLR8LDCU+) is a high-performance copper core spark plug engineered with advanced multi-ground electrode technology for superior ignition reliability and extended service life. This spark plug features a heavy-duty yttrium-enhanced nickel center electrode with a copper core that delivers exceptional durability and heat dissipation compared to standard copper spark plugs.

Key Features:

• Yttrium-enhanced nickel center electrode with copper core for superior reliability and longer service life
• Dual nickel chromium ground electrodes with surface discharge technology provide multiple spark paths and enhanced ignitability
• Factory pre-set electrode gap at 0.039" (1.0mm) - no adjustment necessary
• Nickel-plated rolled threads deliver complete anti-seize and corrosion protection
• Metal glass fused resistor (6K Ohm) ensures maximum radio frequency interference suppression
• Angular 5-rib ceramic insulator design prevents flashover and misfires
• 14mm thread diameter with 19mm (3/4") reach and 5/8" hex size

This spark plug is designed to meet or exceed OE specifications, providing smooth engine operation, steady acceleration, and reliable cold-weather starts. The unique multi-ground electrode design combines surface air gap technology with extended projection for optimal combustion efficiency and plug longevity.

Specifications: 14mm x 1.25mm thread, gasket seat type, solid terminal, 0.039" gap, extended projection. Recommended installation torque: 15-29 lb-ft for cast iron heads, 15-22 lb-ft for aluminum heads.