Manley Chevrolet Small Block Exhaust Valve Kit - 1.500in Head Dia. 5.036in O/A Length, 0.3415in Stem

If you're rebuilding the top end of your Chevrolet small block engine, these exhaust valves from Manley Performance are a solid option. They're specifically designed for high-temperature gasoline engines, meaning they can handle the heat and stress that comes with performance applications. The exhaust valves are made from XH-428 material, which Manley states has nearly double the ultimate tensile strength at 1500°F compared to other common exhaust valve materials like EV-8.

These valves feature chrome stems and hard tips for added durability, and the under-head areas are swirl polished to help improve airflow into the combustion chamber. Manley also mentions that their Severe Duty valves have undergone extensive fatigue testing, enduring up to 100 million cycles at high stress and temperature levels, which they claim is significantly more than competing valves. The head diameter is 1.500 inches, the overall length is 5.036 inches, and the stem diameter is 0.3415 inches.

This kit includes the exhaust valves you'll need for your rebuild. It's always a good idea to refer to the manufacturer's installation instructions for specific details on fitting these valves into your cylinder heads.