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BOSCH 7971
Nickel
  • Tapered, v-profile nickel chromium ground electrode improves starting in cold weather and increased fuel ignitability
  • Nickel-plated rolled threads provide anti-seize properties and corrosion protection
  • Metal glass fused resistor for maximum interference suppression
  • Angular, five-ribbed insulator design prevents misfire due to current leakage

Spark Plug Type Performance Differences

Technical Bulletin for 5.4L 2004-2005 Ford F-150, Expedition, Super Duty & Lincoln Navigator
Center Electrode Core MaterialNickel-Yttrium and Copper
Center Electrode Tip MaterialNickel-Yttrium
Gap Size1.1 MM
Ground ConfigurationStandard
Ground Electrode Core MaterialN/A
Ground Electrode Quantity1
Ground Electrode Tip DesignTapered v-profile
Ground Electrode Tip MaterialNickel-Chromium
Hex Size16
Insulator MaterialCeramic
Manufacturer Heat Range8
Reach17.5 mm
Resistance6000
Seat TypeTapered
Short StyleNo
Thread Diameter14 MM
Alternate/OEM Part Number(s): 7571, HR8DCX

BOSCH Warranty Information
Alternators & Starters w/ Part Number Not Ending In "N": 24 months; Alternators & Starters w/ Part Number Ending In "N": Lifetime Warranty for Non-Commercial Passenger Vehicles; Spark Plug Wire Sets: Lifetime; Wiper Products: 30 days; Fuel Pumps Purchased After 10/1/16: Limited Lifetime. Engine Management Parts (like Air Management Sensors, Engine Position Sensors, Gasoline Fuel Injectors, High Pressure Fuel Pumps, Ignition Coils, Pressure Sensors, Temperature Sensors, Throttle Devices) Purchased After 11/15/16: Limited Lifetime. Engine Management Parts Purchased Before 11/15/16, Fuel Pumps Purchased Before 10/1/16, and All Other Product Lines: 12 months.