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GMC K25 Spark Plug

We have 9 Items In-stock. Select a year to continue.
$3.48 List Price $4.77 Save $1.29 Availability: In Stock
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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


  • SKU#: NG6630
  • Brand: NGK
  • Fit Note: Light Duty
  • Plug Type: Resistor
  • Electrode Core Material: Copper
  • Anticipated Ship Out Time: Same day - 1 business day
  • Electrode Tip Material: Nickel alloy
  • Gap Size: 1.016 mm
(see more)
Fits the following GMC K25 Years:
  • 1977-1978 | 8 Cyl 5.7L | Base, High Sierra, Sierra Classic, Sierra Grande
  • 1976-1978 | 8 Cyl 7.4L | Base, High Sierra, Sierra Classic, Sierra Grande
(see more)
$5.27 List Price $6.22 Save $0.95 Availability: In Stock
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DENSO REGULAR CLASS TRADITIONAL SPARK PLUG

Denso's Regular Class Traditional Spark Plugs guarantee the quality of the product they produce because every component that leaves their factories has been designed with precision, manufactured to the strictest OE standards and subjected to rigorous safety and performance tests.

Specification:
  • 14 mm thread size
  • 11.6 mm reach
  • 0.63 in. hex size
  • 0.04 in. gap size
  • Tapered seat style
  • Resistor plug type
  • U-groove ground electrodes
  • Solid terminal
  • Projected tip
  • Heat range 16

Features:
  • Designed with heavy duty insulator that provides unparalleled dielectric strength and thermal conductivity under extreme temperatures
  • Five-rib design prevents flashover while decreasing voltage loss
  • Copper glass seal bonds the center electrode and insulator together for a gas-tight seal
  • Platinum center electrode utilizes platinum to shrink the surface area of the center electrode tip for maximum firing performance and minimum voltage requirements
  • Platinum ground electrode resists gas and electrical erosion and corrosion extending service intervals to 60,000 miles


  • SKU#: NPT16PRU11
  • Brand: Denso
  • Plug Type: Resistor
  • Electrode Core Material: Copper
  • Anticipated Ship Out Time: Same day - 1 business day
  • Electrode Tip Material: Nickel alloy
  • Gap Size: 1.1 mm
(see more)
Fits the following GMC K25 Years:
  • 1977-1978 | 8 Cyl 7.4L | Base, High Sierra, Sierra Classic, Sierra Grande
  • 1976-1978 | 8 Cyl 5.7L | Base, High Sierra, Sierra Classic, Sierra Grande
$3.56 List Price $4.20 Save $0.64 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
  • 22 mm reach
  • 16 mm hex size
  • 0.9 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
  • SKU#: BS4007
  • Brand: Bosch
  • Fit Note: Light Duty
  • Plug Type: Resistor
  • Electrode Core Material: Platinum
  • Anticipated Ship Out Time: Same day - 1 business day
  • Electrode Tip Material: Platinum
  • Gap Size: 0.9 mm
(see more)
Fits the following GMC K25 Years:
  • 1976-1978 | 6 Cyl 4.1L | Base, High Sierra, Sierra Classic, Sierra Grande
$5.20 List Price $6.14 Save $0.94 Availability: In Stock
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AC DELCO RAPIDFIRE PERFORMANCE PLATINUM SPARK PLUG, SOLD INDIVIDUALLY

AC Delco Rapidfire Performance Platinum Spark Plugs offer longer life and improved efficiency over time. It fits engines that run conventional plugs, as well as newer vehicles that require platinum plugs.

Features:
  • Constructed from top quality materials to help the engine run clean and longer
  • Copper core center electrode for improved heat transfer to the tip
  • Engineered to high standards and tested under extreme conditions to exceed OE specifications


  • SKU#: AC10
  • Brand: AC Delco
  • Fit Note: Truck
  • Plug Type: Resistor
  • Electrode Core Material: Copper
  • Anticipated Ship Out Time: Same day - 1 business day
  • Electrode Tip Material: Platinum
  • Gap Size: OE Replacement
(see more)
Fits the following GMC K25 Years:
  • 1978 | 8 Cyl 7.4L | Base, High Sierra, Sierra Classic, Sierra Grande
  • 1977-1978 | 8 Cyl 5.0L | Base, High Sierra, Sierra Classic, Sierra Grande
(see more)
$14.95 List Price $17.64 Save $2.69 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


  • SKU#: PSTRCB1H10
  • Brand: Pulstar
  • Fit Note: GAS
  • Plug Type: Resistor
  • Electrode Core Material: Copper
  • Anticipated Ship Out Time: Same day - 1 business day
  • Electrode Tip Material: Iridium
  • Gap Size: 1.14 mm
(see more)
Fits the following GMC K25 Years:
  • 1977-1978 | 8 Cyl 7.4L | Base, High Sierra, Sierra Classic, Sierra Grande
  • 1976-1978 | 8 Cyl 5.7L | Base, High Sierra, Sierra Classic, Sierra Grande
(see more)
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$5.61 List Price $6.62 Save $1.01 Availability: In Stock
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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#: MISP425
  • Brand: Motorcraft
  • Fit Note: Light Duty
  • Plug Type: Resistor
  • Electrode Core Material: Copper
  • Anticipated Ship Out Time: Same day - 1 business day
  • Electrode Tip Material: Nickel alloy
  • Warranty: 12-month or 12,000-mile Motorcraft limited warranty
 
Fits the following GMC K25 Years:
  • 1978 | 8 Cyl 6.6L | Base, High Sierra, Sierra Classic, Sierra Grande
  • 1976-1978 | 8 Cyl 7.4L | Base, High Sierra, Sierra Classic, Sierra Grande
(see more)
$4.96 List Price $5.85 Save $0.89 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


  • SKU#: C333025
  • Brand: Champion
  • Plug Type: Resistor
  • Electrode Core Material: Copper
  • Anticipated Ship Out Time: Same day - 1 business day
  • Electrode Tip Material: Nickel alloy
  • Heat Range: 15.5
(see more)
Fits the following GMC K25 Years:
  • 1977-1978 | 8 Cyl 7.4L | Base, High Sierra, Sierra Classic, Sierra Grande
  • 1976-1978 | 8 Cyl 5.7L | Base, High Sierra, Sierra Classic, Sierra Grande
(see more)
$5.95 List Price $8.99 Save $3.04 Availability: In Stock
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E3 DIAMONDFIRE SPARK PLUG, SOLD INDIVIDUALLY -- 14 mm thread size, 11.17 mm reach, 0.62 in. hex size, tapered seat, resistor, 1.016 mm non-adjustable gap size, copper core electrode material, nickel alloy electrode tip material, projected insulator type; Guaranteed to provide more power while using less fuel, quicker starts and less fouling than competitive standard spark plugs.
  • SKU#: PYRE342
  • Brand: E3
  • Fit Note: Except California Emission System, Light Duty, Light Duty
  • Plug Type: Resistor
  • Electrode Core Material: Copper
  • Product Class: Fuel saver
  • Anticipated Ship Out Time: Same day - 1 business day
  • Electrode Tip Material: Nickel alloy
(see more)
Fits the following GMC K25 Years:
  • 1977-1978 | 8 Cyl 5.0L | Base, High Sierra, Sierra Classic, Sierra Grande
  • 1976-1978 | 8 Cyl 7.4L | Base, High Sierra, Sierra Classic, Sierra Grande
$39.71 List Price $46.86 Save $7.15 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
  • SKU#: A358199
  • Brand: Accel
  • Fit Note: 2 Of PN[0576S-4]
  • Plug Type: Resistor
  • Electrode Core Material: Copper
  • Anticipated Ship Out Time: 1-2 Business Days
  • Electrode Tip Material: Copper
  • Thread Size: 14 mm
(see more)
Fits the following GMC K25 Years:
  • 1978 | 8 Cyl 6.6L | Base, High Sierra, Sierra Classic, Sierra Grande
  • 1977-1978 | 8 Cyl 5.0L | Base, High Sierra, Sierra Classic, Sierra Grande
(see more)
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