Equivalents for the Champion spark plug 421
Meet the Champion 421 spark plug featuring reach 19.0 mm, resistor type (RFI-suppressed), heat range hot, tightening torque cast iron 25–35 N·m · aluminium 25–30 N·m — or 180°–240° (½–⅔ turn), thread 14 mm. Browse its 21 equivalents: compatible, interchangeable and replacement spark plugs across NGK, Bosch, Champion, Denso and many more.
Technical information Champion 421 spark plug
- Resistor
- Yes
- Torque
- cast iron 25–35 N·m · aluminium 25–30 N·m — or 180°–240° (½–⅔ turn)
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21 equivalents compatible with the Champion 421 spark plug
No equivalent for this brand selection.
What can replace a Champion 421 spark plug?
The Champion 421 is interchangeable with: Autolite A66, Beru 14-9 DU, Motorcraft SP-423, Beru 14-9 DTU, Beru 14-9 DUO, Motorcraft AGS52CF4. These spark plugs share the same mounting (thread, seat) and heat range.
What are the specifications of the Champion 421?
Thread 14 mm, Reach 19.0 mm, Heat range Hot, Resistor Yes, Seat Flat (gasket), Torque cast iron 25–35 N·m · aluminium 25–30 N·m — or 180°–240° (½–⅔ turn)
Cross-references and specifications are provided for guidance only. The wrench size can vary by brand, and some data is inferred from the plug code or an equivalent reference. Always check the vehicle manufacturer's recommendation before buying and fitting.