Well I payed someone to replace the headgasket on my Z6,the head was warped as well so it had to be machined.Well after all is said and done the motor does not overheat any more but cylinder #1 is not firing at all,I checked for spark and it's there.I'm sure I have fuel cause the other 3 cylinders are firing fine.I took the sparkplug out and it was soaked in oil.So I'm thinking that the valves are either bent or the seals went bad it was running fine before the procedure it just ran hot.What are your opinions?