Fuel Injector Adapter Kit OEM LS3/LS7 wo/Rails

The Fuel Injector Adapter Kit for OEM LS3/LS7 engines without rails is a precision-engineered component designed for LS-series engine builders and performance technicians working with F.A.S.T. LSXR intake manifolds. This kit includes all necessary aluminum adapter fittings and O-ring seals required to establish proper fuel injector connections on LS3 and LS7 platforms, eliminating the need for aftermarket fuel rail systems while maintaining OEM-specification injector positioning and flow characteristics.

Built from aluminum construction, the adapter kit delivers lightweight integration without sacrificing durability or corrosion resistance in high-heat engine bay environments. The O-ring seals included in the package are precision-cut to meet GM LS-series fuel system specifications, ensuring reliable pressure integrity across the full operating RPM range. The compact footprint—weighing just 0.24 lbs with minimal dimensional footprint—allows straightforward installation on engine builds where space around the intake manifold is at a premium. Compatibility with F.A.S.T. LSXR intake manifolds makes this kit essential for builders transitioning OEM LS3/LS7 engines to modern fuel management systems without requiring complete fuel rail replacement.

This adapter kit serves engine builders, powersports technicians, and performance enthusiasts executing LS-series engine swaps, naturally aspirated builds, and turbocharged applications where OEM fuel injector architecture must interface with contemporary intake designs. The kit eliminates guesswork by providing a complete, matched-component solution rather than improvised or mismatched adapters that can compromise fuel delivery consistency. Serious builders who demand precision fitment and verified flow characteristics will find this kit eliminates a critical integration point during engine assembly.