The iconic 426-cubic-inch (7.0-liter) Hemi V8 engine was born in 1964 as a race-spec unit. It was first raced in a Plymouth Belvedere and then banned due to its unavailability in production vehicles.

The Hemi spark plug's location near ... of torque at 4,200 RPM for a dual four-barrel carburetor equipped Ford 427 SOHC. The fairest comparison is likely the 426 Hemi dyno test reported by ...