Dodge built just 740 Coronets with the 426 Hemi for 1966, roughly half of them in range-topping Coronet 500 trim, out of only 2,714 Street Hemi cars built across the entire industry that year. The engine existed for one reason: NASCAR homologation demanded Dodge sell a street version of its race motor. This documented low-mileage example is one that survived being used the way most of them were. Read on for how rare a Coronet 500 Hemi actually is.