Manley Chevrolet 2.020 Dia Dish 5.026 O/A Length Severe Duty Intake Valves (Set of 8)

If you're rebuilding the top end of a Chevrolet engine, especially one that sees high temperatures or demanding use, these Manley Severe Duty intake valves are a solid option. They're designed with specific materials to handle the heat and stress that can break down lesser valves. Each valve measures 2.020 inches in diameter with an overall length of 5.026 inches, and they come as a set of eight.

Manley uses NK-844 material for these intake valves, which they say has over four times the ultimate tensile strength of competing materials at 1000°F. The stems are chromed, and the tips are hardened for better wear resistance. The under-head areas are swirl-polished and the combustion faces are fully machined, which helps improve airflow into the cylinder and can contribute to more efficient combustion. These valves have been put through rigorous fatigue testing, enduring up to 100 million cycles under high stress, which is a notable improvement over many other valves on the market.

These are intended for gasoline engines that operate at high temperatures. If you're working on a performance build or a heavy-duty application, these valves are built to last.