Manley Chevrolet Small Block Exhaust Valve Kit - 1.600in Head Dia. 5.065in O/A Length, 0.3415in Stem

If you're rebuilding the top end of your Chevrolet small block engine, especially for performance or racing applications, new exhaust valves are a critical component. These Manley Severe Duty? exhaust valves are specifically made from XH-428 material, which offers nearly double the tensile strength at high temperatures compared to other common exhaust valve materials like EV-8. This means they can handle the extreme heat and stress inside your engine much better, leading to improved reliability and longevity.

Manley has put these valves through some serious testing. They've endured up to 100 million cycles at 40,000 psi and 1400?F, which is a remarkable figure when you consider that other valves can fail after just 100,000 cycles. The design also includes swirl-polished under-head areas and fully machined faces to help improve airflow into the combustion chamber, contributing to better engine efficiency. Plus, the chrome stems and hard tips add extra durability for a longer service life.

This kit includes exhaust valves with a 1.600-inch head diameter and a 5.065-inch overall length, featuring a 0.3415-inch stem diameter. They are designed for high-temperature gasoline engines and are a solid option for anyone looking for well-built valves that can withstand demanding conditions.