Slant Six
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The Slant six was a Mopar six cylinder motor that began production in 1960. While most other American six cylinder engines had the block orientated with the cylinders north and south at a 90 degree arrangement, the Slant Six (aka the "Leaning Tower of Power") leaned the cylinders over on a slant to allow for the lower hoods in the new compact A-Body models, the Valiant (not originally a Plymouth when released in 1960, but it's own make) and Dodge Lancer.