The Max Wedge gaskets demonstrate the smaller 906 intake-port size. Gasket matching raises the roof of the ports 1/2 inch higher. Flowbench numbers went through the roof after we opened the heads to Max Wedge size. The Indy intake also received port matching, but at .050 inch smaller than the gasket all around. This can prevent air turbulence, a possibility when the motor is bolted together.