http://tinyurl.com/npx6c8s
NEW Head Stud Kit FORD 6.0L Powerstroke Diesel 2003-2007 F250 F350 F450 F550 SD
Material: alloy steel (widely used in short track and drag racing as an upgrade of regular chrome molybdenum)
Tensile Strength (A clamp load): 220,000 psi
Yield strength (stress at which deformation of a material occurs): 180,000 psi
Torque with lube: 205 ft. /lb. Preload: 25, 730
ISO Certified