Radium 20-1070 CNC Fuel Rail for Honda D-Series D15/D16/ZC Engines 8AN ORB

Engine Fitment

• Honda D15B
• Honda D15Z
• Honda D16A
• Honda D16B
• Honda D16Y
• Honda D16Z
• Honda SOHC ZC
• Honda DOHC ZC

Fitment Notes

• Direct fit for all OEM Honda D-series intake manifolds - follows OEM mounting and positioning
• Radium's own fitment note states aftermarket intake manifold compatibility is NOT tested and cannot be verified - this differs from some resellers' marketing copy claiming broader aftermarket manifold compatibility; confirm your specific manifold before ordering
• This is an upgrade rail - reuses OEM or OEM-equivalent injectors (matching height and O-ring diameters), not a top-feed conversion rail
• Radium does not make injector recommendations; consult your tuner or the injector manufacturer for the correct part number

Features

• CNC-machined from 6061 aluminum
• Anodized and laser-etched for a high-quality surface finish
• Large internal bore to support higher fuel-flow demands
• 11mm ID injector bores match OEM sizing - factory or equivalent aftermarket injectors drop in
• 4 ports, 7/8"-14 thread, for 8AN ORB male fittings
• Ample port spacing for larger accessories like regulators, gauges, and pulse dampers

Specifications

• Material: 6061 aluminum (CNC-machined)
• Finish: Anodized, laser-etched
• Injector Bore ID: 11mm (OEM-equivalent)
• Ports: 4x, 7/8"-14 thread, accepts 8AN ORB male fittings
• Rail Type: Upgrade (reuses OEM/OEM-equivalent injectors)

Included Components

• 1x Fuel Rail

Product Description

The Radium 20-1070 is a CNC-machined fuel rail upgrade for Honda D-series engines (D15/D16 and SOHC/DOHC ZC variants), built with a larger internal bore than the factory rail to keep fuel flow from becoming a bottleneck as power climbs. Because the injector bores match OEM 11mm sizing, it accepts factory injectors or any equivalent aftermarket injector without needing an adapter.

Four 8AN ORB ports give plenty of room to route feed and return lines, or mount a fuel pressure regulator, gauge, and pulse damper without crowding the rail. It's designed to bolt to OEM intake manifolds using the stock mounting locations; Radium doesn't test or guarantee fitment on aftermarket manifolds, so that's worth confirming with your manifold's manufacturer first.