VerdictAI

Auto · Spark Plugs

How many spark plugs do I need for my engine?

Reviewer consensus

One per cylinder for most engines: 4 for an inline-four, 6 for a V6, 8 for a V8. HEMI 5.7L and 6.4L V8s are the notable exception with 16 plugs (two per cylinder), which is why those kits are sold in 16-packs and cost more.

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