If you're pushing over 45 psi boost in your Duramax, its likely your engine is experiencing valve float, meaning some of that boost is getting wasted, and in turn could spell a ticking time bomb, as well. This valve spring kit will handle up to a whopping 130 pounds of boost/drive pressure and will help prevent valve float, ensuring efficiency and safe power, even at higher levels. This kit comes complete with conical valve springs, billet steel retainers, chromoly spring seats, and valve locks to provide the best durability and reliability to your valvetrain.