Flowtech Upright Headers

Description Holley’s Flowtech Headers are the perfect combination of quality and value. These Small Block Chevy Upright 1-3/4” or 1-5/8″ tube diameter headers are ideal for even big cubic inch Small Block Chevy engines. These headers have been dyno tested and proven to increase horsepower! Features: CNC Mandrel-bent tubes provide consistent tubing diameters for smooth flow and increases the cylinder scavenging effect and improves engine breathing Heavy duty 16-gauge 409SS tubing for increased strength and durability 1-5/8” and 1-3/4” tubing diameters available for increased exhaust flow increasing performance and improved throttle response 3” collector for maximum strength and exhaust flow Extra thick header flange for a leak-free seal and maximum strength Welded-in collector merge spears to control exhaust gas re-entry into primary tubes