I dont think its the gasket as they very very rarely go on that model it could be the head has cracked or 1 thing i came across before was that a core plug in head had worked its way loose so i cleaned it up and resealed it i couldnt tell you how much it cost as i was in work i just done the job but its a lot cheaper than a cracked head, hope that helps
Noely1986
February 2010