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ENGINEERING THE FUTURE OF PERFORMANCE ™
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Mercedes-Benz

Head Studs, M157
Purchase Head Studs, M157
  • SKU: 01-157-01419-9

    Head Studs, M157

  • $1,499.99

  • Prop 65 warning
    Warning

    This product can expose you to chemicals including carbon black, silica - crystalline, formaldehyde, and lead which are known to the State of California to cause cancer, and lead, which is known to the State of California to cause birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Manufacturer Weistec
Engine Family M157
year make model trim engine
2020 Mercedes-Benz SL550 Base (R231) Twin Turbo 4.7L V8 (M278)
2019 Mercedes-Benz SL550 Base (R231) Twin Turbo 4.7L V8 (M278)
2018 Mercedes-Benz SL550 Base (R231) Twin Turbo 4.7L V8 (M278)
2017 Mercedes-Benz SL550 Base (R231) Twin Turbo 4.7L V8 (M278)
2016 Mercedes-Benz SL550 Base (R231) Twin Turbo 4.7L V8 (M278)
2015 Mercedes-Benz SL550 Base (R231) Twin Turbo 4.7L V8 (M278)
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Weistec has exclusively partnered with ARP, the top name in performance engine hardware. Head studs are used to fasten the heads to the block in place of the factory head bolts. The connection between the cylinder heads and the block is a complex part of the engine. Coolant and oil flow back and forth between the block and the cylinder heads. The head gasket keeps the coolant, oil, and air charge in the cylinders separate from each other with the help of pressure generated by the head bolts. The factory head bolts are "torque to yield" meaning that when installed, they are tightened to the point where they permanently stretch.

With 260,000+PSI of tensile strength, our ARP 625+ head studs are able to hold down the heads with far greater pressure than the factory head bolts, without permanent stretching. The result is a more reliable performance engine. Quality head studs are among the top items in the list of parts that allow an engine to reliably reach high power levels.

Key Features:

  • 260,000 psi Tensile Strength

  • 255,000 psi Yield Strength

  • Complete replacement of factory head bolts

  • Improved Head to Block connection eliminating leaks

  • Reusable, unlike the factory bolts which are "one time use"