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MSD Iridium Spark Plugs are durable enough to withstand the rigors of performance operation using high output ignitions and  they are available for a wide range of engines, applications and heat ranges.

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  • Designed to outlast other performance plugs on the track or on the street
  • Unique insulator design improves spark isolation
  • Superior design for high performance engines
  • Iridium - 40% higher melting point than nickel plugs
  • Lower voltage Requirements for longer coil life

MSD Spark Plugs are durable enough to withstand the rigors of performance operation using high output ignitions.


  1. Yttrium ground electrode alloy reduces electrical wear while a center cut ground electrode ensures un-shrouded spark for improved combustion.
  2. Iridium contact on the center electrode insures long life with high output ignitions.
  3. The space between the center electrode and insulated tip enables a fast evaporation of fuel preventing formation of soft combustable deposits on the insulator tip.
  4. Ground electrode with center copper core reduces temperature and increases mileage intervals.
  5. Copper core center electrode reduces operating temperature promoting long life and reducing the possibility of detonation.
  6. Low resistance seal suppresses EMI (electro magnetic interference)
  7. Zinc-Nickel Chromated shell resists corrosion and seizure.
  8. Proprietary ceramic improves dielectric strength, eliminating failure with high output ignitions.
  9. Fixed Terminal Nut for solid connection.


  • Proprietary plug design inside and out
  • Designed for use on high performance vehicles that utilize high output ignition systems
  • Machined electrode increases exposure to the flame to improve combustion
  • MSD’s proprietary ceramic formula provides the highest dielectric strength
  • Yttrium ground electrode reduces the chance of pre-ignition
  • Iridium tip improves cold starts
  • All spark plugs tested prior to packaging and shipping
  • Shorty-style plugs for applications where space is limited

With over four decades of experience in engineering and manufacturing high output ignition systems, MSD Performance proudly offers High Performance Iridium spark plugs! Whether you’re on the street, trail or track, MSD has a performance plug that will fire up your engine.

Compare The Facts

What makes MSD’s Iridium plugs a cut above the competition? Besides our race winning experience of firing 330 mph top fuel cars, the endurance of 500 mile stock car racing and the brutal expectations of off-road racing, our new spark plugs are designed to perform from the inside out. PERIOD

MSD Heat Range Chart

MSD’s spark plugs are engineered to improve the efficiency of the combustion process to create the most power possible combined with increased durability. The center tip of the plug is made from iridium to promote the best spark and increase resilience. A proprietary ceramic material enhances the dielectric strength of the plug housing forcing the spark, even under extreme cylinder pressures, to jump across the plug gap to the ground electrode. This electrode is machined to expose more spark to the incoming gases to promote the most effective combustion event possible.

MSD Plug Style Code

I = Iridium
R = Resistor
5 = Heat Range
Y = Projected Tip
L = Extended Procected Tip

Heat Range

The term "spark plug heat range" can be misleading. Mny think that it has something to do with a hotter spark and it does NOT. The heat range of a spark plug is its ability to transfer heat from the combustion chamber to the cylinder head. The heat transfer pulls heat out of the cumbustion chamber and at the same time awaw from te spark plug tip. This is most commonly done by changing the contact area of the porcelain insulator nose to the shell during manufacturing. A visual comparison of the two extremed make this very clear, looking at the colder plug you can see where the porclain meets the shell and on the hotter plug the point where the porcelain meets the shell is further down inside.

As a general rule of thumb use the coldest plug possible without fouling at low speed or idle. The use of too hot a plug may cause severe engine damage. The guideline for the differende in tip temperature from each heat range to the next is 70°C to 100°C. 

Considerations in choosing the heat ranges:
If an engine is normally operated at low speeds or at low temperatures then, a hotter heat range may be required to keep the spark plug from fouling. If the engine is modified, operates at high RPM, under heavy loads or at high temperature then, a colder heat range spark plug will be necessary to helt prevent detonating or pre-igniting.

All engine modifications which increase cylinder preassure typically increase cumbusted temperatures, and therefore, increasing these temperatures will require a colder heat range. So, if you think you need a higher octane fuel to keep the engine from pinging, you will probably need a colder plug as well.

It is important to follow the cylinder head manufacturers recommended torque specification for the spark plugs. It is also a good practice to put a small amount of anti-seize compound on the treads, but be sure that it does NOT insulate the spark plug from the cylinder head.


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MSD Spark Plug Dimensions - PDF

Spark Plug Cross Reference Guide - PDF
MSD Cross Reference with NGK® Stock Number to Plug Type

Spark Plug Torque Specs - PDF
Recommended Spark Plug Torque Specifications

Spark Plug Failure Guide - PDF
Quick Reference Plug Failure Guide

Spark Plug Terminal and Boot Attachment - PDF
Simple steps to follow while installing spark plug wires - Prevent Breakdowns

MSD Spark Plug Application Guide - PDF

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How to Select Spark Plugs for Your Engine

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MSD Iridium Spark Plugs

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