Hi Tony, thanks for your help...... bled at stat housing, i had 3 thermostats before one would fit, took it out today and it ran to what seemed like exactly the same patterN. Spoke withe James at MSD and he has said to bring the car back next week... I have spent a fortune rebuilding this car and would like to find out what it could be. May not be the correct stat, i dont know? People i have spoken with have said it could be a cracked head possibly.... hope not, any advice would be mucch appreciated, many thanks!!!!