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Mercury Medalist Spark Plug

We have 5 Items In-stock. Select a year to continue.
$16.76 List Price $19.78 Save $3.02 Availability: In Stock
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NGK WR5IX IRIDIUM IX SERIES SPARK PLUG, SOLD INDIVIDUALLY -- 18 mm thread, 10.9 mm reach, 20.6 mm hex size, tapered seat, resistor, solid terminal, projected tip, fine wire 0.6 mm iridium center electrode, tapered cut ground electrode, one ground strap quantity, 1.016 mm gap, heat range 5; Designed specifically for the performance enthusiast; Offers extreme ignitability, improved throttle response and superior anti fouling; Iridium alloy has extremely high melting point making it perfect for today's high-tech and high performance engines; Features fine iridium tip that ensures high durability and a consistently stable spark; Trivalent metal plating offers superior anti-corrosion and anti-seizing properties; Delivers outstanding acceleration, high fuel efficiency and durability with its ultimate design, technology and performance.
  • SKU#: NG7510
  • Brand: NGK
  • Electrode Core Material: Copper
  • Plug Type: Resistor
  • Anticipated Ship Out Time: 1-2 Business Days
  • Electrode Tip Material: Iridium
  • Gap Size: 1.016 mm
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Fits the following Mercury Medalist Years:
  • 1956-1958 | 8 Cyl 5.1L | Base
$2.97 List Price $3.50 Save $0.53 Availability: In Stock
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DENSO REGULAR CLASS TRADITIONAL SPARK PLUG, SOLD INDIVIDUALLY -- 18 mm thread, 11.6 mm reach, 13/16 in. hex size, tapered seat, resistor type, removable terminal, projected tip, U-groove ground electrode, 0.027 in. gap size, 20 heat range; Designed with heavy duty insulator that provides unparalleled dielectric strength and thermal conductivity under extreme temperatures; The five-rib design prevents flashover while decreasing voltage loss; Its copper glass seal bonds the center electrode and insulator together for a gas-tight seal; Features a platinum center electrode that utilizes platinum to shrink the surface area of the center electrode tip for maximum firing performance and minimum voltage requirements; The platinum ground electrode resists gas and electrical erosion and corrosion extending service intervals to 60,000 miles.
  • SKU#: NP5013
  • Brand: Denso
  • Electrode Core Material: Copper
  • Plug Type: Resistor
  • Anticipated Ship Out Time: Same day - 1 business day
  • Gap Size: 0.027 in.
  • Reach: 11.6 mm
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Fits the following Mercury Medalist Years:
  • 1956-1958 | 8 Cyl 5.1L | Base
$2.76 List Price $3.26 Save $0.50 Availability: In Stock
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BOSCH REGULAR CLASS SUPER PLUS SPARK PLUG

Bosch Regular Class Super Plus Spark Plug has a heavy duty yttrium enhanced copper core center electrode for superior reliability and increased resistance to spark erosion.

Specifications:
  • 18 mm thread size
  • 11.2 mm reach
  • 20.8 mm hex size
  • 0.9 mm gap
  • Tapered seat style
  • Interference suppression resistor
  • Yttrium enhanced copper core center electrode
  • Tapered V-profile nickel ground electrode
  • Removable terminal nut
  • Heat range 10

Features:
  • Tapered V-profile nickel ground electrode provides improved starting in cold weather and increased fuel ignitibility
  • Metal glass fused resistor allows for maximum interference suppression while the ribbed insulator design prevents misfires due to current leakage
  • SKU#: BS7551
  • Brand: Bosch
  • Electrode Core Material: Copper
  • Plug Type: Resistor
  • Anticipated Ship Out Time: 1-2 Business Days
  • Electrode Tip Material: Nickel alloy
  • Gap Size: 0.9 mm
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Fits the following Mercury Medalist Years:
  • 1956-1958 | All Engines | All Submodels
$3.88 List Price $4.58 Save $0.70 Availability: In Stock
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MOTORCRAFT SUPPRESSOR SPARK PLUG, COPPER, SOLD INDIVIDUALLY

0.04 in. gap size, standard service plug; Delivers maximum voltage to the spark plug while maximizing performance and increases engine life; Resists corrosion and abrasion; Reduces the chance of misfire.


  • SKU#: MISP431
  • Brand: Motorcraft
  • Electrode Core Material: Copper
  • Plug Type: Resistor
  • Anticipated Ship Out Time: Same day - 1 business day
  • Electrode Tip Material: Copper
  • Reach: 18 mm
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Fits the following Mercury Medalist Years:
  • 1956-1958 | 8 Cyl 5.1L | Base
$4.76 List Price $5.62 Save $0.86 Availability: In Stock
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CHAMPION TRADITIONAL SPARK PLUG, SOLD INDIVIDUALLY -- 18 mm thread diameter, 11.6 mm reach, 20.6 mm hex size, resistor type, tapered seat, projected core nose; Made of corrosion resistant zinc plated shell with copper plus core design; Features the most durable high voltage semiconductor; Conforms to all ISO and SAE standards.
  • SKU#: C3322
  • Brand: Champion
  • Electrode Core Material: Copper
  • Plug Type: Resistor
  • Anticipated Ship Out Time: Same day - 1 business day
  • Electrode Tip Material: Copper
  • Reach: 18 mm
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Fits the following Mercury Medalist Years:
  • 1956-1958 | 8 Cyl 5.1L | Base
Select more Mercury Medalist parts under Spark Plugs, Wires & Components from list below.