In our April 2000 issue ("Beyond The Flow Numbers"), we addressed the technology that allows the LS1 head to provide power. It involves real advancements over previous technology. Addressing not just air volume, but also the path of the air, has led to improvements, and even more improvements have been realized since the LS1 head was initially produced. We went to CNC Cylinder Heads in Pinellas Park, Florida, and spoke with Pete Incaudo to find out about changes in the LS6 heads that are used on the Z06 Corvette.
Pete said that when he received his first set of LS6 heads, he was pleasantly surprised. He stated that in stock form the LS6 heads are very good castings, and went as far as to say that the LS6 intake ports are equal in machine work to one of his CNC-prepped LS1 heads. That's a pretty lofty endorsement. Of course, that doesn't mean there isn't any room for improvement.
For now, the very improvements that make the LS6 heads desirable are the same aspects that prevent their use on the LS1.
It's only a matter of time, though, until the aftermarket begins producing parts to make the most of these platforms. At that time, an intake that's adaptable for both sets of heads may be produced to allow more choices.