Motorcraft SP-421 - Alternative spark plugs

There are 1 replacement spark plugs for Motorcraft SP-421. The cross references are for general reference only, please check for correct specifications and measurements for your application. When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include Amazon Associates.

Indirect matches

There are 6 replacements for Autolite HT2. These are indirect matches for Motorcraft SP-421

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Replacement spark plugs for Motorcraft SP-421 on Amazon

The spark plug Cross References are for general reference only. Check for correct application and spec/measurements. Any use of this cross reference is done at the installers risk.

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