Notes: Aluminum. Square port. Chevy small block.

Notes: Round port; large race; 2.15" port diameter;

Notes: Medium square race port; port dimensions W-1.45" x H-1.55";

Notes: Ultra seal; oval port; port dimensions W-1.25" x H-1.75";

Notes: Ultra seal; late blackjack/cyclone/flowtech oval port headers; port dimensions W-1.50" x H-1.82";

Notes: Copper Seal; 1.50" Port Diameter;

Notes: Port dimensions W-1.78" x H-1.48";

Notes: All D port including RAM air III; port dimensions W-1.5" x H-1.94";

Notes: Copper seal; medium square race port; port dimensions W-1.45" x H-1.55";

Notes: Ultra seal; port dimensions W-1.3" x H-1.8";