415HP from 318ci IS POSSABLE!!

You can build a 318 to make 450 HP and be perfectly streetable. How do you do it? FORCED INDUCTION. Or design some DOHC 4-valve-per-chamber heads for it. People forget that most of the engines we deal with here are cam-in-block 2-valve-per-chamber engines with wedge-type chambers that were designed in the 1950's and '60's. NOT the most efficient design out there but they can make a lot of power simply because they are big and very tough. People have to understand that these engines have a power threshold that once passed there is no way to get good gas mileage or be easy to drive around every day.