Dress up your Big Block Chevy 396-400-427-454 engine with these brand new Grade 8 ARP (American Racing Products) Stainless head bolts. These bolts are not only good looking, and don’t rust, but are super strong for your high horsepower needs and have a polished finish. These bolts have a tensile strength of 170,000 psi and are stronger than the stock head bolts. This head bolt kit is for the outside of the valve cover head bolts only. These fit the stock cast iron heads.