08-10 6.4L HEAD STUD KIT POWERSTROKE 250-420308 10 6. 4L HEAD STUD KIT POWERSTROKE 250 4203 For those with higher than stock boost on their 08 10 6. 4L Ford Powerstroke, investing in an ARP head stud kit is a wise precaution against potential head gasket failure. These head studs are trusted by top professional engine builders for their unbeatable performance on all out competition powerplants. Made from a premium grade 8740 alloy, ARP head studs are heat treated to a strength of 200,000 psi and
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