A "318" Detroit is actually an 8V-71, with 568 cubic inches. 318 is the most common horsepower rating, although they can go from 290 to 350 HP, depending on fuel injector size, and whether or not they're turbocharged in addition to the built-in Rootes blower. a 6-71 inline is usually called a "238", even though its actual displacement is 426 cubic inches. 238 was the most common horsepower rating.
Confused yet?
Jerry
