MORE INFO NEEDED LIKE,
 a head gasket ?
 a exhaust gasket ?
 a  inlet manifold gasket ?
The first one is the DEAREST due to the work involved entrust this to a garage due to locking tools required to keep the cams in phase with the crank ,get this wrong and the piston gets HOLED by a VALVE.
                
 wirecutterman
                
 July 2009