The "slant-six" is a type of inline six-cylinder engine that was designed by Chrysler in the 1960s. Its unique feature is the slanted orientation of the engine block, which allows for a lower hood line and improved aerodynamics. This design also contributes to better weight distribution and handling in vehicles. The slant-six engine was known for its durability and simplicity, making it popular in various Chrysler models, including the Dodge Dart and Plymouth Valiant. It was produced for several decades, with various displacements and configurations, and remains a favorite among classic car enthusiasts today.