As Durasmoke said, you can check what you are currently running and replace with the same grade, Assuming the heads do NOT need to be milled. You can check your heads for warpage with a strait edge and a light. If they are warped you will have to have them milled and then check the pistons pertrution to figure out what grade gasket you will need.Alright thanks alot! How do I know which gasket I need?