Hi .im a newbie to the land rover scene,im looking for advice.I may be buying a disco 3.9 1995 which is very clean,low miles and never welded.but theres a noise coming from nearside head /top end ,owner has changed manifold gaskets which was thought to be the problem its intermitant not a heavy sound a sort of chirpy blowing noise [hard to explain in words!]or could it a valve?. Has anybody come across something like this or any ideas.Any help would be appeciated as it will help in deciding wether to buy or not,thanks Andy