1.75-Inch Primary Tube Full-Length Header

The Doug's Headers D625-B is a full-length performance header engineered to provide maximum power gains across the entire RPM spectrum for 1966-1969 Ford/Mercury FE Big Block engines equipped with a floor shift. This header is constructed from durable 16-gauge steel and features CNC mandrel-bent tubes for precise fitment and optimized flow. The primary tubes measure 1.75 inches in diameter, leading to a 3-inch collector with a rectangular port shape. To ensure a secure and leak-free seal, it includes 0.375-inch thick machined flanges that are designed to prevent warping. The header is finished with a Hi-Temp Black Coating, offering a durable, matte black appearance that provides protection against rust and corrosion. Included with the D625-B are all necessary mounting hardware and premium gaskets, simplifying the installation process. The product notes specify that installation on power steering cars requires power steering bracket PN H7609, and it is designed for models without a factory oil cooler. This header is legal for use on pre-emissions controlled vehicles.