Billet, double adjustable, carburetor fuel logs for superior fitment. The advantage of a company that understands engineering, design, and manufacturing, is peace of mind. When you buy a fuel log from Aeromotive, you can be assured they will fit and deliver as promised. Threaded with 9/16? ? 24 ORB (o-ring boss) for proper sealing on carburetors like the Holley Ultra-HP and those with similar float bowls. Carburetor inlets swivel + or ? 20 degrees in all directions for optimum clearance from valve cover and intake runners. Telescoping center line is 7.700? to 13.450? adapts to standard and high capacity float bowls. ORB-10 inlet and outlet ports can be adapted from AN-12 to AN-06 with available Aeromotive ORB port fittings. Two 1/8? NPT ports for gauges and/or pressure transducers. 1.056/.806? ID bore for high flow capacity. Type II bright-dip black anodized finish for durability and great looks.