Proven Benefits

-100% maintenance free operation

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

BMW Z4 Series

with additional support available through support@motivmotorsport

S58 CNC Cylinder Head Stud Conversion ARP-HSK Proven BenefitsCNC 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