You're tooling along on your way home from a cruise night or a car show when you pull up to a stop sign. As the engine drops down to an idle, you hear astrange sound from under the hood. It's not a ...

While some Gen IV engines do use cathedral port cylinder heads, pretty much all are of the later, LS6 design. By 2009, cathedral port use was mostly restricted to just the 5.3L engines while all but ...