Exhaust Valves for fourstroke engines. grade parts designed to worn or damaged exhaust valves and restore proper exhaust sealing. Purpose and benefits: Controls exhaust gas flow and sealing under temperature. Made from a temperature alloy steel for heat and corrosion resistance. Maintains stable valve lift and seating, contributing to reliable compression and idle performance. Material and size: Constructed from heatresistant alloy steel. Available in standard and metric sizes to fit common cylinder heads. Please match valve head size, stem diameter, and overall length to your engine specifications. Compatibility: Designed for use with OEM and many aftermarket cylinder heads and valve trains. Verify fit for your engine model. Performance notes: Improved exhaust flow and seal integrity when installed with proper guides and seats. Consistent operation under temp and pressure, supporting longer service life. Use scenarios: 1) Rebuilding a passenger car engine: worn exhaust valves to restore power and compression. 2) Performance or street build: upgrade exhaust valves for better flow in a revving engine. 3) Marine or portable generator service: restore exhaust valve function to maintain reliable starts and steady idle. Installation tip: Requires valve lapping, proper seat cutting, and correct valve spring compatibility. Professional service recommended if you are unsure.