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Mercury S-55 Spark Plug

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Mercury S-55 Spark Plug, NGK V-Power Spark Plug - Direct Fit

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$2.80 $3.30 You Save $0.50 (15%)
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NGK WR5 V-POWER SPARK PLUG, SOLD INDIVIDUALLY

NGK V-Power Spark Plug has a unique V-power design that directs the spark to the edge of the electrode where it develops more rapidly to improves ignitability than OE manufacturer and racer approved.

Specifications:
  • 18 mm thread size
  • 10.9 mm reach
  • 20.6 mm hex size
  • Tapered seat style
  • Resistor plug type
  • Solid terminal nut
  • Projected tip
  • V-grooved centered electrode
  • Nickel alloy tip
  • One ground strap quantity
  • Heat range 5

Features:
  • Increases ignitability even in lean burn conditions and lowers ignition system voltage requirements
  • Increases fuel economy and lower emissions
  • Trivalent metal plating has superior anti-corrosion and anti-seizing properties
  • Highly durable against electrical and chemical wear


  • Sku#: NG2438
  • Brand: NGK
  • Series: NGK V-Power
  • Product Fit: Direct Fit
  • Quantity Sold: Sold Individually
  • Electrode Core Material: Copper
  • Plug Type: Resistor
  • Anticipated Ship Out Time: Same day - 1 business day
  • Electrode Tip Material: Nickel alloy
  • Gap Size: 1.016 mm
  • Notes: Ships to U.S. addresses only. Cannot be shipped internationally.
  • Reach: 10.9 mm
  • Thread Size: 18 mm
  • Warranty: 60-day NGK limited warranty
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Fits the following Mercury S-55 Years

  • 1966 | Base | 8 Cyl 6.4L
  • 1966 | Base | 8 Cyl 6.7L
  • 1966 | Base | 8 Cyl 7.0L
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Mercury S-55 Spark Plug, Denso Standard Spark Plug - Direct Fit

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$3.67 $4.33 You Save $0.66 (15%)
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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, 0.032 in. gap size, 16 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#: NP5008
  • Brand: Denso
  • Series: Denso Standard
  • Product Fit: Direct Fit
  • Quantity Sold: Sold Individually
  • Electrode Core Material: Copper
  • Plug Type: Resistor
  • Anticipated Ship Out Time: Same day - 1 business day
  • Gap Size: 0.032 in.
  • Reach: 11.6 mm
  • Thread Size: 18 mm
  • Warranty: 1 year Denso limited warranty
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Fits the following Mercury S-55 Years

  • 1966 | Base | 8 Cyl 7.0L

Mercury S-55 Spark Plug, Motorcraft Suppressor Spark Plug - Direct Fit

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$3.04 $3.59 You Save $0.55 (15%)
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MOTORCRAFT SUPPRESSOR SPARK PLUG, COPPER, SOLD INDIVIDUALLY

Delivers maximum voltage to the spark plug while maximizing performance and increases engine life; Resists corrosion and abrasion; Reduces the chance of misfire.


  • Sku#: MISP420
  • Brand: Motorcraft
  • Series: Motorcraft Suppressor
  • Product Fit: Direct Fit
  • Quantity Sold: Sold Individually
  • Electrode Core Material: Copper
  • Plug Type: Resistor
  • Anticipated Ship Out Time: Same day - 1 business day
  • Electrode Tip Material: Nickel alloy
  • Warranty: 1 year or 12,000-mile Motorcraft limited warranty
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Fits the following Mercury S-55 Years

  • 1966 | Base | 8 Cyl 6.4L
  • 1966 | Base | 8 Cyl 6.7L
  • 1966 | Base | 8 Cyl 7.0L
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Mercury S-55 Spark Plug, Champion Traditional Spark Plug - Direct Fit

$4.76 $5.62 You Save $0.86 (15%)
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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
  • Series: Champion Traditional
  • Product Fit: Direct Fit
  • Quantity Sold: Sold Individually
  • Electrode Core Material: Copper
  • Plug Type: Resistor
  • Anticipated Ship Out Time: Same day - 1 business day
  • Electrode Tip Material: Copper
  • Reach: 18 mm
  • Thread Size: 11.6 mm
  • Warranty: 1-year Champion limited warranty
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Fits the following Mercury S-55 Years

  • 1966 | Base | 8 Cyl 6.4L
  • 1966 | Base | 8 Cyl 6.7L

Select more Mercury S-55 parts under Spark Plugs, Wires & Components from list below.

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