Spark Plugs & Ignition Wires

The spark plug is the last component in the ignition chain — and the one that actually ignites the charge. A plug that's the wrong heat range, worn beyond spec, or fouled from a rich mixture will cost power and cause misfires that no ignition box can compensate for. This collection covers spark plugs, ignition wire sets, spooled wire, plug boot kits, boot protectors, wire holders, distributor caps, distributor rotors, and all related ignition components built for maximum spark energy and reliable ignition on any engine combination.

Spark plugs are available in copper, platinum, and iridium electrode configurations across a full range of heat ranges for naturally aspirated, forced induction, and nitrous applications. Heat range selection is critical — a plug that's too hot causes pre-ignition and detonation on a performance engine; too cold and the plug fouls under light-load driving. Performance engines with elevated compression, forced induction, or nitrous typically require a colder plug than the factory specification. Projected tip designs improve ignitability under lean or high-velocity airflow conditions. Recessed tip designs protect the electrode in high-boost applications where a projected tip would be exposed to excessive heat.

Spark plug wire sets are the final link between the ignition coil and the plug. High-performance wire sets with spiral-wound or straight-wound conductors minimize radio frequency interference while maximizing energy delivery to the plug gap. Wire diameter — 8mm, 8.5mm, and 10mm — affects both suppression capability and current-carrying capacity. Matched wire sets are available for popular domestic V8 and six-cylinder applications in a range of colors and boot configurations to suit any engine bay layout. Spooled wire and boot kits allow custom-length wire fabrication for non-standard routing, engine swaps, and builds where off-the-shelf sets don't fit cleanly.

Plug boot protectors shield the boots from exhaust heat on tight header installations where the wire runs close to the primary tubes — a common failure point on performance builds with long-tube headers. Wire separators and holders keep the wire set organized, prevent contact between wires that can cause cross-fire, and give the engine bay a finished, professional appearance.

Distributor caps and rotors are wear items that should be inspected and replaced on a regular service interval — and immediately on any performance build where ignition reliability is a priority. Carbon tracking, worn contacts, and cracked caps cause misfires and timing scatter that degrade performance and can damage pistons on high-compression engines. Performance caps with brass terminals and vented designs improve durability and heat dissipation over standard OEM units.

This collection serves every engine combination — mild street rebuilds running stock plugs and OEM-style wires, high-compression naturally aspirated builds requiring colder plugs and high-energy wire sets, forced induction and nitrous applications demanding the correct plug heat range and gap for the power level, and classic restorations sourcing correct-style ignition components.

Spark plug and wire set replacement is one of the most accessible maintenance and performance tasks available — basic hand tools and 30–60 minutes cover most V8 applications. Always gap plugs to the manufacturer's specification for your specific ignition system and application before installation. Verify wire routing clears exhaust components before finalizing the installation.

Shop the full Spark Plugs & Ignition Wires collection and make sure every cylinder fires exactly as it should.

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  • NGK V-power Racing Plug 4554 .750in Reach- Std Tip R5671A-8
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    NGK V-power Racing Plug 4554 .750in Reach- Std Tip R5671A-8
    $6.99 USD
    $6.99 USD
    NGK V-power Racing Plug 4554 .750in Reach- Std Tip R5671A-8 is a NGK spark plugs designed to support consistent ignition performance, dependable combustion, and proper service replacement on compat...
  • NGK Spark Plug Stock # 7692 MR8AI9
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    NGK Spark Plug Stock # 7692 MR8AI9
    $12.99 USD
    $12.99 USD
    NGK Spark Plug Stock # 7692 MR8AI9 is a NGK spark plugs designed to support consistent ignition performance, dependable combustion, and proper service replacement on compatible applications. This l...
  • NGK Spark Plug Stock # 6706 LKAR8AI-9
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    NGK Spark Plug Stock # 6706 LKAR8AI-9
    $17.49 USD
    $17.49 USD
    NGK Spark Plug Stock # 6706 LKAR8AI-9 is a NGK spark plugs designed to support consistent ignition performance, dependable combustion, and proper service replacement on compatible applications. Thi...
  • NGK Spark Plug Stock # 3284 FR5GP
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    NGK Spark Plug Stock # 3284 FR5GP
    $4.19 USD
    $4.19 USD
    NGK Spark Plug Stock # 3284 FR5GP is a NGK spark plugs designed to support consistent ignition performance, dependable combustion, and proper service replacement on compatible applications. This li...
  • NGK Spark Plug Stock # 2887 DPR5EA-9
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    NGK Spark Plug Stock # 2887 DPR5EA-9
    $3.99 USD
    $3.99 USD
    NGK Spark Plug Stock # 2887 DPR5EA-9 is a NGK spark plugs designed to support consistent ignition performance, dependable combustion, and proper service replacement on compatible applications. This...
  • NGK Spark Plug Stock # 4578 CR7E
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    NGK Spark Plug Stock # 4578 CR7E
    $6.39 USD
    $6.39 USD
    NGK Spark Plug Stock # 4578 CR7E is a NGK spark plugs designed to support consistent ignition performance, dependable combustion, and proper service replacement on compatible applications. This lis...
  • NGK Spark Plug Stock # 6965 CR6E
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    NGK Spark Plug Stock # 6965 CR6E
    $8.99 USD
    $8.99 USD
    NGK Spark Plug Stock # 6965 CR6E is a NGK spark plugs designed to support consistent ignition performance, dependable combustion, and proper service replacement on compatible applications. This lis...
  • NGK Spark Plug Stock # 6689 CR5EH-9
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    NGK Spark Plug Stock # 6689 CR5EH-9
    $13.99 USD
    $13.99 USD
    NGK Spark Plug Stock # 6689 CR5EH-9 is a NGK spark plugs designed to support consistent ignition performance, dependable combustion, and proper service replacement on compatible applications. This ...
  • NGK Spark Plug Stock # 7447 (marine) BUZ8H
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    NGK Spark Plug Stock # 7447 (marine) BUZ8H
    $10.49 USD
    $10.49 USD
    NGK Spark Plug Stock # 7447 (marine) BUZ8H is a NGK spark plugs designed to support consistent ignition performance, dependable combustion, and proper service replacement on compatible applications...
  • NGK Spark Plug Stock # 2322 BUE
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    NGK Spark Plug Stock # 2322 BUE
    $15.99 USD
    $15.99 USD
    NGK Spark Plug Stock # 2322 BUE is a NGK spark plugs designed to support consistent ignition performance, dependable combustion, and proper service replacement on compatible applications. This list...
  • NGK Spark Plug Stock 6431 BU8H
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    NGK Spark Plug Stock 6431 BU8H
    $5.99 USD
    $5.99 USD
    NGK Spark Plug Stock 6431 BU8H is a NGK spark plugs designed to support consistent ignition performance, dependable combustion, and proper service replacement on compatible applications. This listi...
  • NGK Spark Plug Stock # 1134 BR8HS-10
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    NGK Spark Plug Stock # 1134 BR8HS-10
    $3.69 USD
    $3.69 USD
    NGK Spark Plug Stock # 1134 BR8HS-10 is a NGK spark plugs designed to support consistent ignition performance, dependable combustion, and proper service replacement on compatible applications. This...
  • NGK Spark Plug Stock 5422 BR8ES
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    NGK Spark Plug Stock 5422 BR8ES
    $3.49 USD
    $3.49 USD
    NGK Spark Plug Stock 5422 BR8ES is a NGK spark plugs designed to support consistent ignition performance, dependable combustion, and proper service replacement on compatible applications. This list...
  • NGK Spark Plug Stock # 3035 BR8ECM
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    NGK Spark Plug Stock # 3035 BR8ECM
    $14.49 USD
    $14.49 USD
    NGK Spark Plug Stock # 3035 BR8ECM is a NGK spark plugs designed to support consistent ignition performance, dependable combustion, and proper service replacement on compatible applications. This l...
  • NGK Spark Plug Stock # 6801 (snowmobile) BR10EIX
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    NGK Spark Plug Stock # 6801 (snowmobile) BR10EIX
    $10.99 USD
    $10.99 USD
    NGK Spark Plug Stock # 6801 (snowmobile) BR10EIX is a NGK spark plugs designed to support consistent ignition performance, dependable combustion, and proper service replacement on compatible applic...
  • NGK V-power Racing Plug 7317 R5724-8
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    NGK V-power Racing Plug 7317 R5724-8
    $3.99 USD
    $3.99 USD
    NGK V-power Racing Plug 7317 R5724-8 is a NGK spark plugs designed to support consistent ignition performance, dependable combustion, and proper service replacement on compatible applications. This...

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