8x Genuine Motorcraft Platinum Spark Plug SP-546 PZK-14F

Description

Genuine Motorcraft Platinum Spark Plug – SP-546 (PZK-14F)

Part Number: SP-546
OEM Equivalent: Factory-installed plug from new
Manufacturer: Motorcraft (Ford Genuine)

Construction & Specs

• Electrode Type: Platinum (center)

• Center Electrode Core: Nickel

• Center Electrode Tip: Platinum

• Ground Electrode Tip: Nickel

• Thread Size: M16 x 1.50

• Seat Style: Tapered

• Drive Size: 14 mm

• Resistor: Yes

• Insulator: Standard, non-projected

• Heat Range: Motorcraft 1

• Shell Finish: Nickel-plated (corrosion resistant)

Performance & Benefits

• OEM-specified spark plug fitted when the vehicle rolled off the assembly line

• Designed for quick cold starts, smooth acceleration, and consistent idle

• Supports enhanced fuel economy

• Long service life: approx. 60,000–100,000 miles (depending on application & use)

• Copper-glass seal bonds the insulator, terminal post, and center electrode to:

  • Maintain required firing voltage

  • Reduce misfires

  • Improve durability under heat and load

Typical Applications

Commonly used in various Ford petrol engines (including Modular V8 and selected inline applications – exact fitment depends on model/year).

⚠️ Important: Always confirm vehicle application and calibration requirements.
Forced-induction or modified engines may require a different heat range or plug type.