PORTS AND FITTINGS The fuel rail ports are tapped for 8AN ORB. 8AN ORB Adapter Fittings 8AN ORB Direct Mount Regulators 8AN ORB Fuel Pulse Dampers Fuel Pressure Gauge Adapters COMPATIBILITY This fuel rail has been confirmed to work with the following Honda engines: H22A1, H22A4, H23A1, F20A, F20B, F22A1, F22A4, F22A6 OVERVIEW Manufactured with a large internal bore, the fuel rail can support all necessary engine power requirements. They are CNC machined from 6061 aluminum, anodized, and laser etched for a high quality surface finish. Like the OEM fuel rails, the injector bores are 11mm ID so factory injectors, or any equivalent aftermarket injector, can be used.  FUEL INJECTOR COMPATIBILITY This fuel rail is compatible with factory or OEM equivalent fuel injectors. If upgrading fuel injectors, consult your aftermarket injector supplier for details. Radium Engineering cannot specify any further injector dimensions other than stating ‘OEM equivalent’. SETUP20-0870 Fuel Rail, Honda F-H-Series This kit only includes the fuel rail and the mounting hardware, making it ideal for custom applications. Extra fittings, hoses and other fuel plumbing items will be needed to complete the installation. Instruction PDF