Hi All,
I think it must be my head gasket as I have fixed up a 2ltre bottle to the header in engine bay and boy is there lots of air coming out! I have pumped the top hose until all bubbles gone, thermostat now opens water rises from bottle and then floods out followed by loads of bubbles. It fills bottle from cold up and up until the bubbles come out carries on bubbling for ages (temp at 3/4 and does not go higher. and then water drops back down when bubbles stop. It does this in a cycle. I smelt the bubbles and thought I could smell exhaust fumes (hard to tell but getting a sniff test done later today to confirm.
If it is the head gasket what is the best bet, bearing in mind I do not want to increase compression as detonation is near with 10psi pulley on supercharger and a head skim will increase it so wanted a fat gasket maybe? Roe do one but it is thinner which would be a double whammy skim and thin!!
Thanks everyone for your help and advice