hi folks was looking to pick a few brains. i have a 4*4 saph, it did a headgasket in. i got the head skimmed and put a burton group a head set in. ive done about 500 miles since. pulls well, no missfires, running 100%. only prob is its using water. there is no leaks anywere, ive checked a dozen times. i took it for a run tonight and when i got back to my garage i pulled the bonnet and took the water bottle cap off will it was running and topped the water bottle back up. i left the lid off and noticed the top pipe for the water bottle that runs to the top water pipe for the turbo was blowing air bubbles back into the water bottle. i watched for 5 mins odd and it kept on doing so. any thoughts whats going on with it? or were the water is going to? the car runs fine, holds temp and cools fine. cheers for any info