Chrysler’s second generation Hemi arrived in 1964 as a race engine barely disguised as a production part, and its nickname came honestly. The 426 stood 10.72 inches at the deck, spread its bores 4.80 inches apart, and needed an engine bay most cars did not have. Roughly 11,000 street versions were ever built. Read on for how NASCAR banned it, why the valvetrain made it so expensive, and what made it the default choice for nitro racing.