GSC P-D Nissan VR30DDTT Manganese Bronze Stopper Exhaust Valve Guide +.001in Oversize OD - Single

When you're rebuilding the top end of your Nissan VR30DDTT engine, getting the valve guides right is crucial for proper sealing and performance. These GSC Power Division exhaust valve guides are made from manganese bronze, a material known for its good wear resistance and lubricity, which helps keep your valves moving smoothly. They are manufactured to be +.001 inch oversize on the outside diameter, meaning they're intended for applications where the cylinder head has been machined to accept this slightly larger size for a snug fit.

Using a material like manganese bronze helps dissipate heat effectively and reduces friction between the valve stem and the guide. This is important for exhaust valves, which operate at higher temperatures than intake valves. The +.001 inch oversize OD is a specific measurement for engines that have had their valve guide bores opened up to this size, ensuring a precise fit and proper alignment of the valve in the port.