Not compatible with O-ringed or grooved engine blocks—requires smooth

- Vipec ECUs: V88

As motorsports teams and race enthusiasts push the S58 beyond 800 horsepower

5mm installed height

S58 CNC Cylinder Head Stud Conversion ARP-HSK Not compatible with O-ringed orCNC Cylinder Head Stud Conversion If youre building a S58 engine thats going to see 1200HP+, the way your head studs are set up is critical. We CNC machine cylinder heads to properly convert them for larger head studs, making sure everything is aligned, consistent, and accurately positioned. This isnt a quick drill job or a close enough fitment. Its done on a CNC machine so the geometry is exactly where it needs to be every time. Some shops will