When you unfortunately must replace a head gasket in your 12 Valve 5.9L Cummins, sourcing all of the gaskets and seals needed can be a real headache. Make it easy for yourself with the Cummins .020 Over Thickness Upper Engine Gasket Kit. This kit comes with everything needed to perform a head gasket job including .020 over head gasket, exhaust manifold gaskets, intake manifold gaskets, valve seals, valve cover gaskets, and much more. This kit is designed for heads that needed to be resurfaced as the head gasket included is a .020 over thickness. Replace your head gasket like the pros with this kit from Cummins.