S1 & S2 RB25 Hydraulic Head Replacement VCT Bung When genuine Nissan parts are not available, the right solution is an upgrade. The RB25 Hydraulic Head Replacement VCT Bung is a precision brass replacement designed for lost, damaged, or unusable factory units. Built specifically for the RB and Skyline performance market, this part delivers a clean, reliable, and professional solution for both standard RB25 builds and RB25/30 hybrid conversions. Perfect for engine builders, workshops, and enthusiasts who demand an OEM+ finish with modern convenience. Key Features Direct replacement for RB25 hydraulic heads Ideal for lost or damaged original bungs Precision M4 internal thread for easy future removal Pre-pilot drilled for RB25–RB30 conversion use Datum mark on the end for accurate drilling reference No external oil lines required One part, two applications Clean, no-mess installation Dual Fitment Design This plug has been engineered to suit two popular RB applications. RB25 Block Install the bung as supplied for direct use in RB25 builds. RB25-30 Conversion For RB25 head to RB30 block conversions, the bung includes a hidden pre-pilot drilled oil feed path. To activate VCT oil feed: Use a 3mm to 5mm drill bit Drill into the end of the plugs datum mark. Drill depth: approximately 1.5–2mm Use the datum mark as your guide This uncovers the internal pilot-drilled port and enables proper VCT function on RB30 blocks. Installation Place the bung in the freezer for 15–25 minutes Apply a thin smear of retaining compound to the threaded end of the plug Insert into the head for a secure fit Designed for convenience, clean installation, and reliable long-term use. One part. Two options. No mess. No fuss. Easy install. Perfect for RB25DET, RB25/30, Skyline and performance engine builds.
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