The SneedSpeed Cylinder Head Stud Kit - All our studs are 220,000 psi, centerless ground, heat treated, 8740 custom chromoly alloy to handle the toughest loads and high boost levels. For owners who want a stronger, more reliable head to engine seal—especially if your car runs on boost or high RPM. Stock head bolts stretch over time, but our stud kit provides consistent clamping force and better sealing to prevent gasket leaks. The studs are reusable, making maintenance easier and more precise.
Mini Cooper S and JCW models (R55–R59) powered by the N14 or N18 engines. Factory head bolts can stretch and lose clamping force over time—especially under boost. This bolt-on stud kit delivers race-quality clamping strength, precise sealing, and long-term reliability, making it ideal for high-performance street cars, track builds, or engine rebuilds.
If you're pushing your Mini harder than stock—or just want extra peace of mind—this kit ensures your cylinder head stays firmly sealed to the block, preventing head gasket issues and costly engine damage.
Key Features:
- Built for Boost & High RPMs: Made from forged 8740 chromoly steel studs for extreme durability and clamping force—perfect under high cylinder pressure.
- Reusable Stud Design: Unlike one-time-use torque-to-yield bolts, these studs can be reused for future engine work or rebuilds.
- Accurate & Even Clamping: Comes with 12-point nuts and hardened washers for precise torque application and steady head pressure across the engine.
- Precision Fitment: Tailored for 2007–2015 Mini Cooper S / JCW (R55, R56, R57, R58, R59) with N14/N18 engines. No cutting or modifications required.
- Complete Kit: Everything you need is included: studs, nuts, washers, plus full installation instructions.
- R5X-R6X head stud torque specs
