Reinforced high traction studs for Lancia Delta - Fiat Coupe 2000 16v it is necessary to drill and rethread the engine block with a diameter of 12mm and a pitch of 1.25. Not suitable for 8v engines , for these we have a dedicated stud kit.
ProtoXide studs are oversized and reinforced and have been tested for years on super engines of over 600 hp without showing any problems.
They ensure better tightening for a perfect head gasket fit.