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Engines and Components› Pistons and Piston Rings

Ford

Iridium Spark Plug Set

Name: Iridium Spark Plug Set
Brand: Ford
SKU: M-12405-35T

$67.00 $54.37 Save $12.63

SKU: M-12405-35T

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Overview

The Ford Performance cold spark plug set is designed for 3.5L Ford F-150 EcoBoost models from 2011 to July 2021. These spark plugs feature platinum construction with a copper electrode tip and core, and are pre-gapped to 0.031-inch. They offer a more stable thermal range and are one heat range colder than stock, making them suitable for engines with higher than stock cylinder combustion pressures, supercharged, turbocharged, or forced induction applications.

Installation is straightforward and can be completed without modifications, typically taking about an hour. Each set includes six spark plugs and is a direct-fit replacement for your existing plugs.

Show original supplier description

The Ford Performance M-12405-35T spark plugs are designed as a one-step colder option for enhanced performance in tuned Ford EcoBoost engines. This set includes six iridium-tipped spark plugs with a projected insulator, a 14mm thread size, and a tapered seat design. It is important to note that these plugs are not pre-gapped and require careful adjustment to a gap of .026-.028 inches before installation. These spark plugs are specifically engineered for compatibility with the following Ford vehicles and engines: 2017-2026 3.5L Raptor/F150, 2018-2020 2.7L F150, and 2021-2026 3.5L engines. While they fit the 2021-2026 3.5L engines, they utilize a tapered design rather than an OEM washer. Installation requires precise torqueing to 11.1 ft-lbs. For optimal performance and longevity, especially in tuned applications, it is recommended to change these spark plugs every 15,000-20,000 miles. Due to the specific nature of this performance upgrade, returns are not accepted on this item.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

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Specifications

Brand	Ford
Part Number	M-12405-35T
Category	Ignitions and Electrical

Videos

Every 3.5 EcoBoost Owner Should Do This Immediately (F150/Raptor Step Colder Spark Plug Install)

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Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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