Valve Seal - Acura/Honda Intake 5.5mm

The Valve Seal - Acura/Honda Intake 5.5mm by FERREA is a precision engine component engineered for Honda and Acura four-cylinder intake valve systems requiring exact stem diameters and positive sealing action. This 5.5mm valve stem seal is essential for mechanics and enthusiasts rebuilding or refreshing cylinder heads on naturally aspirated and modified Honda powerplants, where oil control at the valve guide interface directly impacts compression sealing, ring blow-by reduction, and overall engine longevity. Quality valve seals prevent oil from migrating down the stem into the combustion chamber, a critical function that deteriorates under heat cycling and high-RPM operation.

FERREA's Valve Seal - Acura/Honda Intake 5.5mm utilizes Viton rubber construction, a synthetic elastomer chosen for superior thermal stability and chemical resistance compared to standard nitrile seals. The positive-stop design prevents the seal from sliding up the valve stem under vacuum conditions, maintaining consistent interference fit and reliable sealing across idle, cruise, and wide-open-throttle operating ranges. The 5.5mm stem specification matches OEM Honda intake valve stem diameters found across B-series, K-series, and other Honda four-cylinder platforms, ensuring correct fitment without modification or shimming during head assembly.

Technicians performing top-end rebuilds, valve job work, or cam swap installations on Acura RSX, TSX, TL, and Honda Civic, Accord, and S2000 platforms will find this seal indispensable for maintaining factory oil consumption specs and combustion chamber cleanliness. Installation requires careful alignment onto the valve stem before guide insertion; the individual seal format allows selective replacement without full guide replacement, making it ideal for spot repairs or complete head gasket overhauls. Each unit is sold individually, allowing builders to purchase exactly the quantity needed for single-cylinder, partial, or full-head refresh jobs.