Supertech Toyota FRS / Subaru BRZ FA20D Manganese Bronze Exhaust Valve Guide 5.5mm Stem

Manganese bronze is a solid choice for exhaust valve guides, and this Supertech guide uses it for its good wear resistance, especially under the heat of exhaust gases. This particular guide is made to fit the 5.5mm stem found on the FA20D engine, common in the Toyota FRS and Subaru BRZ. When you're rebuilding the top end of one of these engines, getting the valve guides right is crucial for proper valve sealing and smooth operation.

This guide is designed as a direct replacement, meaning it should fit right into the cylinder head where the original guide was. The 5.5mm stem diameter is a precise measurement that ensures the valve can move freely without excessive play, which is important for maintaining compression and preventing oil from getting past the valve stem. Choosing a well-built guide like this helps ensure your engine's valvetrain performs as it should after the rebuild.