While the LS1 Gen III V-8 is a great engine design, the real mind-numbing components are the cylinder heads. The symmetrical, cathedral intake ports are a result of massive amounts of experience, testing, and innovation. They were built out of necessity to fit between the pushrods, the four head bolts, and other systems but are impressive in their ability to flow air. The design is common between all the cars and trucks through 2005, which makes it easy to swap parts for power. These are GM Performance Parts CNC-ported cylinder heads that will yield additional power.
Gen III GM Small Block Tech