A-31431591-AI Valve, ExhaustOne New Aftermarket Replacement Exhaust Valve for Perkins 3. 152 4. 203 Diesel Engines This aftermarket replacement exhaust valve fits Perkins 3. 152 and 4. 203 series diesel engines. It is machined to a 45 degree valve face angle and is designed for use with the ZZ80082 cylinder head. The exhaust valve controls the release of combustion gases from the cylinder, and proper valve condition is critical to engine compression, performance, and longevity.