head gasket twin cam?

sounds as if your valve timing is out a tooth

wickham
May 2010

you need to re check marks are where they should be and belt is right tension. you might be lucky and get away with putting timing back where it should be or it might have bent some valves. you dont say what car or engine it is so i cant help any further yet.

me
May 2010

And the car is??? Make/Model/Year/Engine size

confused
May 2010

its a timing problem

sl
May 2010