The SP H13 Head Stud set comes with Studs, Washers, and Bolts for a complete installation. No Modification to your cylinder head or block is required as these are a direct drop-in replacement .
The H13 upgrade has 25% more clamping force than ARP 8740 studs. They are USA made from fine grain hi-strength, heat treated H13 tool steel, that is also used in Funny Car and Top Fuel Dragsters. With a tensile strength of 240,000psi
-More block thread engagement then ARP
-Dog point tips and 10mm rolled threads for maximum strength
-Hex tip for install
-Recommended for applications boosting higher than 25 PSI
-Fits 3.2L VR6 engines
*Not for use with head spacers*