The Edelbrock #3637 Fuel Rail is designed for use with the #50565 Pontiac Torker II EFI Manifold. The manifold and fuel rail kit work with Pico injectors (1.50" O-ring center-to-center spacing) only. ?This kit contains two machined fuel rails and mounting hardware. The cross-over plumbing and regulator requirements depend on the application, so the customer will need to supply their own. The fuel rail ends are tapped for -6 AN fittings.