The Powerstroke Products Loaded 6.7L Cummins Cylinder Head With HD Springs is the perfect option for those looking to get the most out of their 2007.5-2018 Cummins. This brand new casting comes complete with 103 lb. valve springs, new valvetrain components, and is shipped completely assembled, making it easy to install and get back on the road. Best of all, it comes with a 1 year / unlimited mileage warranty, so you can be confident in your purchase.