What year 300 six cylinder had the most horsepower?

The 300 six-cylinder engine that produced the most horsepower was the 1963 model, which was part of Chrysler's "Slant-Six" family. This engine generated up to 175 horsepower, thanks to improvements in design and performance enhancements made during that era. The 300 series was known for its powerful engines, and the 1963 six-cylinder variant stood out among its contemporaries.