if you changed the headgasket it can be numerous things considering you didnt tell us exactly what you did and what steps you took during the HG change. explain the process when you did the change for us to further help you.



..but if you want an answer now it can be one, two or a combination of many: improper torque, miscalibrated torque wrench, warped head, warped block, cracked head, cracked block, bad headgasket, backwards gasket, misaligned head, debris between head and block, too much torque, wrong gasket, sunken sleeve