it's a MUST to have the block drilled and tapped professionally prior to installation

Radium Engineering vent valves feature roll-over protection for fuel cells and gas tanks

Selecting the 1mm oversize valve option requires the installation of copper valve seats for proper fitment and sealing

they may no longer fit the valve stem correctly

S14 Cylinder Head Service by 5150 AutoSport Service:Pro-Xtreme it's a MUST to have5150 AutoSport Performance Cylinder Head Services for BMW S14 Engines Please note that price is based on customer providing core. If you need help sourcing a core, please contact our sales team. Investing in a performance cylinder head service is crucial for optimizing engine potential in performance builds. We offer three levels of service to meet your budget and build goals, from OEM refresh to full race level machining: Stage 1 OEM Refresh (Rebuild