Manley Chevrolet Big Block Exhaust Valve Kit - 1.720in Head Dia. 5.354in O/A Length, 0.3715in Stem

If you're rebuilding the top end of a Chevrolet Big Block engine, especially one that sees hard use, these Manley Severe Duty? exhaust valves are a solid choice. They're made from XH-428 material, which is a strong alloy that holds up well in high-temperature gasoline engines. This specific kit includes exhaust valves with a 1.720-inch head diameter and a 5.354-inch overall length, featuring a 0.3715-inch stem diameter.

What really sets these valves apart is their durability. Manley tested them extensively and found they can withstand up to 100 million cycles at high temperatures and stress levels that would cause many other valves to fail much sooner. They also have chrome stems and hard tips for added wear resistance, and the under-head areas are swirl-polished to help improve airflow into the cylinder.

These valves are designed to handle the demands of performance engines. When you're putting together a high-performance build, using well-made components like these Manley valves can make a real difference in reliability and performance over the long haul.