Supertech BMW S14 Manganese Bronze Int/Exh Valve Guide 7mm Stem Oversize OD 12.065mm - Set of 8

Made from manganese bronze, these valve guides from Supertech are built for the BMW S14 engine. They feature an oversize outer diameter of 12.065mm and are designed for a 7mm valve stem, making them a direct replacement for worn or damaged guides in your engine's cylinder head. This set includes eight guides, enough for a full engine rebuild.

Manganese bronze is a solid material choice for valve guides because it offers good wear resistance and lubricity, which helps reduce friction between the valve stem and the guide. This is important for maintaining proper valve sealing and preventing premature wear on both components. The oversize OD means these are intended for cylinder heads that have been machined to accept them, often as part of an engine overhaul where the original guide bores have been enlarged.