ARP Head Bolt Kit. Kit comes with (10) head studs, (10) parallel ground washers, and (10) 12-point nuts needed for a direct bolt on, as well as the ARP moly-lube and instruction sheet.
Studs are 8470 chrome moly steel, with a black oxide coating for corrosion resistance. The studs are thread-rolled after heat treat, and center-less ground which results in a studs that has 2000% better fatigue strength than others.
ARP studs are rated at 200,000 PSI. ARP bolt additionally feature a reduced wrenching 12-point nut head and wide area flange to permit the use of larger diameter valve springs and eliminate the need for valve train removal during cylinder head re-torquing.
All Toyota 1.3L, 1.5L 4E-FE/4E-FTE, 5E-FE engines