Thanks for the replys I've been reading about head spacers.There seems to be quite a split over there reliability.I am currently running about 8psi but would like to increase that if possible.What spacers and metal gaket do you recommend?The head was rebuilt when the engine was installed in the car so I'm hopeing non of the valves have been burnt. I haven't taken any pic's at the moment but when I do I will upload a few.