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Mercury Monarch Spark Plug

We have 8 Items In-stock. Select a year to continue.
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Mercury Monarch Spark Plug, NGK V-Power Spark Plug - Direct Fit

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$3.23 $4.77 You Save $1.54 (32%)
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NGK UR4 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:
  • 14 mm thread size
  • 11 mm reach
  • 16 mm hex size
  • 0.04 in. gap size
  • Tapered seat style
  • Resistor plug type
  • Solid terminal nut
  • Projected tip
  • V-grooved centered electrode
  • Heat range 4

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


  • Brand SKU#: NGK 6630
  • Series: NGK V-Power
  • Product Fit: Direct Fit
  • Quantity Sold: Sold Individually
  • Electrode Core Material: Copper
  • Plug Type: Resistor
  • Anticipated Ship Out Time: 1-2 Business Days
  • Electrode Tip Material: Nickel alloy
  • Gap Size: 1.016 mm
  • Notes: Ships to U.S. addresses only. Cannot be shipped internationally.
  • Reach: 11 mm
  • Thread Size: 14 mm
  • Warranty: 60-day NGK limited warranty
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Fits the following Mercury Monarch Years

  • 1975-1976 | Base | 8 Cyl 5.0L
  • 1975-1976 | Ghia | 8 Cyl 5.0L
  • 1975-1977 | Base | 8 Cyl 5.8L
  • 1975-1977 | Ghia | 8 Cyl 5.8L
  • 1976 | Grand Ghia | 8 Cyl 5.0L
  • 1976 | Grand Ghia | 8 Cyl 5.8L
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Mercury Monarch Spark Plug, Denso Platinum TT Spark Plug - Direct Fit

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$5.76 $6.80 You Save $1.04 (15%)
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Denso Platinum TT OE Replacement Spark Plug

Denso is the world's leading provider of high quality automotive merchandises which are engineered from the modernized facilities and equipments. Denso's proficiencies with their products are better than rivals as they initially built them along with their strict and valued standards.

Denso Platinum Twin Tip Spark Plugs features revolutionary twin tip design that provides better ignitability for a more powerful and fuel-efficient combustion yielding better engine performance in terms of power and fuel economy.

Features:

  • Improves mileage and reduces carbon emissions
  • Provides additional power and quicker starts

Item Details:

  • .63 in. hex size
  • Platinum alloy 1.1 mm fine wire center electrode
  • Titanium enhanced 1.5 mm fine wire ground electrode
  • Tapered seat style
  • Solid terminal nut
  • Brand SKU#: Denso PTF16TT
  • Series: Denso Platinum TT
  • Product Fit: Direct Fit
  • Quantity Sold: Sold Individually
  • Electrode Core Material: Platinum
  • Plug Type: Resistor
  • Anticipated Ship Out Time: Same day - 1 business day
  • Electrode Tip Material: Platinum
  • Gap Size: 1.1 mm
  • Heat Range: 16
  • Reach: 11.6 mm
  • Thread Size: 14 mm
  • Warranty: 1 year Denso limited warranty
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Fits the following Mercury Monarch Years

  • 1975-1977 | Base | 8 Cyl 5.8L
  • 1975-1977 | Ghia | 8 Cyl 5.0L
  • 1975-1977 | Ghia | 8 Cyl 5.8L
  • 1975-1980 | Base | 8 Cyl 5.0L
  • 1976 | Grand Ghia | 8 Cyl 5.0L
  • 1976 | Grand Ghia | 8 Cyl 5.8L
  • 1980 | Base | 8 Cyl 4.2L
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Mercury Monarch Spark Plug, Bosch Platinum Plus Spark Plug - Direct Fit

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$4.27 $5.04 You Save $0.77 (15%)
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Availability: In Stock
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BOSCH SUPER CLASS PLATINUM PLUS SPARK PLUG

Bosch Super Class Platinum Plus Spark Plug reaches self cleaning temperature faster for quicker starts, smoother acceleration, and increased fuel efficiency. Metal glass fused resistor allows for maximum interference suppression while the ribbed insulator design prevents misfires due to current leakage.

Specifications:
  • 14 mm thread size
  • 11.2 mm reach
  • 16 mm hex size
  • 1.1 mm gap
  • Platinum plug
  • Tapered seat style
  • Interference suppression resistor
  • Heat fused platinum center electrode
  • Tapered yttrium enhanced ground electrode
  • Heat range 9

Features:
  • Platinum center electrode that is heat fused into the extended ceramic insulator
  • Tapered V-profile nickel ground electrode provides improved starting in cold weather and increased fuel ignitability
  • Brand SKU#: Bosch 4008
  • Series: Bosch Platinum Plus
  • Product Fit: Direct Fit
  • Quantity Sold: Sold Individually
  • Electrode Core Material: Platinum
  • Plug Type: Resistor
  • Anticipated Ship Out Time: Same day - 1 business day
  • Electrode Tip Material: Platinum
  • Gap Size: 1.1 mm
  • Reach: 11.2 mm
  • Thread Size: 14 mm
  • Warranty: 1 year or 12,000-mile Bosch limited warranty
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Fits the following Mercury Monarch Years

  • 1975-1976 | Base | 8 Cyl 5.8L
  • 1975-1976 | Ghia | 8 Cyl 5.8L
  • 1975-1977 | Ghia | 8 Cyl 5.0L
  • 1975-1980 | Base | 8 Cyl 5.0L
  • 1976 | Grand Ghia | 8 Cyl 5.0L
  • 1976 | Grand Ghia | 8 Cyl 5.8L
  • 1980 | Base | 8 Cyl 4.2L
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Mercury Monarch Spark Plug, AC Delco Conventional Spark Plug - Direct Fit

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$3.23 $3.81 You Save $0.58 (15%)
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Availability: In Stock
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AC DELCO – CONVENTIONAL OE REPLACEMENT SPARK PLUGS

Choose AC Delco’s Conventional OE replacement spark plugs for reliable firing and superior protection against rust and carbon fouling. Established in 1899, AC Delco manufactures original GM parts and premium OE replacement parts for other brands in the automotive aftermarket.

  • Strictly manufactured to provide reliable function
  • Copper-core electrode optimizes heat transfer and protects against carbon fouling
  • Ground and center electrode sheathing made with nickel-chrome alloy to prevent rust
  • Widespread coverage includes most older models
  • Hot-tip insulator designed for hot, rapid firing
  • Brand SKU#: AC Delco R45TS
  • Series: AC Delco Conventional
  • Product Fit: Direct Fit
  • Quantity Sold: Sold Individually
  • Electrode Core Material: Copper
  • Plug Type: Resistor
  • Recommended Use: OE Replacement
  • Anticipated Ship Out Time: Same day - 1 business day
  • Electrode Tip Material: Nickel alloy
  • Gap Size: OE Replacement
  • Notes: With cast iron heads
  • Thread Size: 14 mm
  • Warranty: 100,000-mile AC Delco limited warranty
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Fits the following Mercury Monarch Years

  • 1976 | Grand Ghia | 8 Cyl 5.0L
  • 1976 | Grand Ghia | 8 Cyl 5.8L
  • 1976-1977 | Base | 8 Cyl 5.8L
  • 1976-1977 | Ghia | 8 Cyl 5.0L
  • 1976-1977 | Ghia | 8 Cyl 5.8L
  • 1976-1980 | Base | 8 Cyl 5.0L
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Mercury Monarch Spark Plug, Motorcraft Suppressor Spark Plug - Direct Fit

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$8.44 $9.96 You Save $1.52 (15%)
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Availability: In Stock
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MOTORCRAFT SUPPRESSOR SPARK PLUG, SINGLE PLATINUM, SOLD INDIVIDUALLY

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


  • Brand SKU#: Motorcraft SP502
  • 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: Platinum
  • Warranty: 1 year or 12,000-mile Motorcraft limited warranty
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Fits the following Mercury Monarch Years

  • 1975 | Base | 8 Cyl 5.0L
  • 1975 | Base | 8 Cyl 5.8L
  • 1975 | Ghia | 8 Cyl 5.0L
  • 1975 | Ghia | 8 Cyl 5.8L
  • 1980 | Base | 8 Cyl 4.2L
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Mercury Monarch Spark Plug, Champion Single Platinum Power Spark Plug - Direct Fit

$4.96 $5.85 You Save $0.89 (15%)
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Availability: In Stock
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CHAMPION SINGLE PLATINUM POWER PLUG, SOLD INDIVIDUALLY

Champion Single Platinum Power Plugs reduce and maintain gap growth and proper gap. The voltage needed to fire them remains consistent, reducing the chance of misfire.

Specifications:
  • 14 mm thread diameter
  • V-trimmed ground electrode
  • Tapered seat
  • Projected tip

Features:
  • Center and side electrodes are tapered for performance while platinum tip on center electrode guarantees extended plug life


  • Brand SKU#: Champion 3025
  • Series: Champion Single Platinum 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
  • Heat Range: 15.5
  • Reach: 14 mm
  • Thread Size: 11.6 mm
  • Warranty: 1-year Champion limited warranty
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Fits the following Mercury Monarch Years

  • 1975-1977 | Base | 8 Cyl 5.8L
  • 1975-1977 | Ghia | 8 Cyl 5.0L
  • 1975-1977 | Ghia | 8 Cyl 5.8L
  • 1975-1980 | Base | 8 Cyl 5.0L
  • 1976 | Grand Ghia | 8 Cyl 5.0L
  • 1976 | Grand Ghia | 8 Cyl 5.8L
  • 1980 | Base | 8 Cyl 4.2L
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Mercury Monarch Spark Plug, Accel U-Groove Spark Plug - Direct Fit

Best Seller
$39.71 $46.86 You Save $7.15 (15%)
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Availability: In Stock
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ACCEL - U-GROOVE SPARK PLUGS

For a fuller, hotter spark that improves throttle response, gas mileage and high RPM power, owners choose Accel’s patented U-Groove spark plugs. Made with purified Alumina insulators to prevent arcing and utilizing machine-rolled threads to protect the heads, U-Groove spark plugs have been an enthusiast’s favorite for many years. Accel has over four decades of designing and manufacturing race-winning fuel and ignition systems.

  • Less arcing with purified Alumina insulators
  • Cleaner, more efficient combustion because of hotter spark
  • Burns faster and high RPM efficiency
  • Reduced misfiring and fouling
  • Crisp throttle response and increased mileage
  • Threads are machine rolled to protect heads
  • Brand SKU#: Accel 8199
  • Series: Accel U-Groove
  • Product Fit: Direct Fit
  • Quantity Sold: Set of 8
  • Electrode Core Material: Copper
  • Plug Type: Resistor
  • Recommended Use: Performance
  • Anticipated Ship Out Time: 1-2 Business Days
  • Electrode Tip Material: Copper
  • Heat Range: 6
  • Reach: 0.46 in.
  • Thread Size: 14 mm
  • Warranty: 90-day Accel limited warranty
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Fits the following Mercury Monarch Years

  • 1975-1976 | Base | 8 Cyl 5.8L
  • 1975-1976 | Ghia | 8 Cyl 5.8L
  • 1975-1977 | Ghia | 8 Cyl 5.0L
  • 1975-1980 | Base | 8 Cyl 5.0L
  • 1976 | Grand Ghia | 8 Cyl 5.0L
  • 1976 | Grand Ghia | 8 Cyl 5.8L
  • 1980 | Base | 8 Cyl 4.2L
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Mercury Monarch Spark Plug, Pulstar Iridium Pulse Spark Plug - Direct Fit

$14.95 $17.64 You Save $2.69 (15%)
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Availability: In Stock
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PULSTAR IRIDIUM PULSE SPARK PLUG, SOLD INDIVIDUALLY

Pulstar Pulse Spark Plug contains integrated electrical capacitor that focuses on the energy of the plug. Its electrical energy delivers the fuel mixture far beyond the typical conventional spark plugs and produces not only better fuel efficiency, but also increased torque and horsepower.

Specifications:
  • 14 mm thread size
  • 11.6 mm reach
  • 16 mm hex size
  • 1.14 mm gap
  • 0.5 mm fine-wire iridium tipped center electrode with copper core
  • Tapered seat
  • Resistor
  • Nickel alloy ground electrode

Features:
  • Latest in performance ignition technology
  • Provides up to 12 percent more horsepower and torque plus livelier throttle response than conventional spark plugs
  • Allows more efficient burning of fuel and generates a much larger spark at twice the speed than ordinary spark plugs
  • Promotes an increased gas mileage and greater horsepower to the wheels
  • Reduces carbon dioxide emissions and provides cleaner exhaust and more efficient combustion
  • Uses an internal circuit that delivers up to 1,000,000 watts of peak power that increases peak spark current by up to 20,000 times that of a traditional spark plug


  • Brand SKU#: Pulstar CB1H10
  • Series: Pulstar Iridium Pulse
  • 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: Iridium
  • Gap Size: 1.14 mm
  • Reach: 14 mm
  • Thread Size: 14 mm
  • Warranty: Lifetime Pulstar limited warranty
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Fits the following Mercury Monarch Years

  • 1975-1977 | Base | 8 Cyl 5.8L
  • 1975-1977 | Ghia | 8 Cyl 5.0L
  • 1975-1977 | Ghia | 8 Cyl 5.8L
  • 1975-1980 | Base | 8 Cyl 5.0L
  • 1976 | Grand Ghia | 8 Cyl 5.0L
  • 1976 | Grand Ghia | 8 Cyl 5.8L
  • 1980 | Base | 8 Cyl 4.2L
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