https://www.slashgear.com/2121450/why-hemi-engines-have-16-spark-plugs-reason-modern-models/
Your HEMI Engine May Have 16 Spark Plugs (And For Good Reason)
Mar 16, 2026 - The modern HEMI V8 isn't a hemi engine in the true sense of the word, and it uses two spark plugs per cylinder instead of one. The science is fascinating.
16 spark plugshemi engine