The 421 is a spark plug manufactured by AUTOLITE. If the AUTOLITE 421 is unavailable, 19 verified equivalents are available from brands like ACDELCO, BOSCH, CHAMPION.
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Specifications
Specifications are still being gathered for this part. Check back soon.
Looking for detailed specs? Try a cross-reference equivalent below — they may have more information.Looking for detailed specs? Check the cross-reference equivalents — they may have more information.