RB In Car Valve Spring ToolBuilt from first hand experience in high performance engine building, the HRB RB In Car Valve Spring Compressor Tool offers a smart solution for valve spring service without needing to remove the cylinder head. Designed specifically for twin cam NISSAN RB engines, this tool makes an otherwise frustrating job faster, safer, and more controlled. Recognising the challenges unique to RB hydraulic lifter heads where the valve retainers sit deep in the