not really sure what was the real cause of it. I just know i had some shit going on with the car with the fuel sytem and then relise during that time i guess some valves bent. i dont build motors or nothing so i couldnt tell why it happen. i do know i had the motor checked out by someone who does and said that everything looks good besides that and all i need to do is replace the bent ones and put a new head,gasket and water pump. lmk guys, i need this gone.