Manley Chevrolet Small Block Exhaust Valve Kit - 1.600in Head Dia. 5.240in O/A Length, 0.3110in Stem

Manley Performance is well-known for making strong internal engine components, and this exhaust valve kit is a great example of that. If you're working on a Chevrolet small block engine and need to replace your exhaust valves, this kit uses XH-428 material, which is a step up from common materials like EV-8. This material is chosen for its ability to handle high temperatures and stress, making it a solid option for gasoline engines that run hot.

These valves have undergone extensive fatigue testing, enduring up to 100 million cycles at 1400°F, which is significantly more than many other valves can handle. They also feature chrome stems and hard tips to improve their lifespan. The under-head areas are swirl-polished and the combustion faces are fully machined, which helps with airflow into the cylinder and can lead to more efficient combustion.

This kit includes exhaust valves with a 1.600-inch head diameter and an overall length of 5.240 inches, with a 0.3110-inch stem. When rebuilding or upgrading your engine's top end, using well-made valves like these can make a notable difference in performance and longevity.