Manley Titanium Exhaust Valve Kit - Noonan Race Engineering - NRE - X1 Pro Mod

This is a set of Manley Performance Titanium Exhaust Valves, specifically the NRE X1 Pro Mod version. These valves are built for serious engine work, especially in high-RPM racing applications where every ounce of weight savings and durability counts. By using titanium, Manley significantly cuts down on the weight of the valve train, which helps the engine rev faster and more freely. This is crucial for engines that spend a lot of time at high revolutions per minute, like those found in Pro Mod drag racing.

What sets these apart is their one-piece forged construction. This method ensures a solid, consistent grain flow throughout the valve, making it much stronger and less prone to failure than valves that are welded together. They are machined with very tight tolerances on advanced CNC equipment, meaning they'll seal perfectly and operate smoothly. Manley uses special titanium alloys chosen for their strength, hardness, and ability to withstand high temperatures without losing their shape or integrity. The 'B' in the part number indicates they use a Bead Loc keeper groove, a detail that helps ensure the keeper stays securely in place even under extreme conditions.

Because these are high-performance titanium valves, they require tip protection to prevent wear. You'll need to use a Manley wear cap, like part number 42104 or 42104TM, or the Manley LocCap System. This is a common requirement for titanium valves in demanding applications to ensure longevity. This kit includes a set of 8 valves, each with a 1.900-inch head diameter and a 0.3415-inch stem diameter, and an overall length of 6.200 inches.