8mm Head Stud Set, 12.7mm Longer Then Stock, Chromoly

EMPI 8mm Chromoly Head Stud Set - 12.7mm Longer for Stroker Engines

High-Performance Clamping Power

When building a high-performance VW aircooled engine, standard studs often lack the tensile strength to handle increased cylinder pressure and thermal expansion. This EMPI 00-4021-0 kit is engineered from high-grade chromoly and precision machined to resist stretching and fatigue. This ensures your heads stay sealed and your combustion chamber remains secure even under extreme racing or high-heat conditions.

Vehicle Fitment & Application

This 8mm head stud set is specifically designed for Type 1, 2, and 3 VW engines (Beetle, Karmann Ghia, Bus, and Squareback) featuring dual port heads. Because these studs are 12.7mm (1/2 inch) longer than stock, they are the industry standard for "stroker" engine builds. If you are using cylinder spacers, long-stroke crankshafts, or long-rod configurations where standard studs are too short to reach the nuts, this kit is the correct solution.

Pro Tech Tips for Installation

1. Use High-Pressure Lubricant: To achieve accurate torque readings and prevent thread galling, always apply a small amount of high-pressure assembly lube or Moly grease to the threads and the seating surface of the hardened washers before tightening. Never install these dry.

2. Verify Case Saver Compatibility: Ensure your engine case is equipped with 8mm case savers (inserts). These studs are designed to thread into these steel inserts, providing a significantly stronger anchor point than threading directly into the softer magnesium or aluminum case material.

3. Check Cylinder Fin Clearance: When using oversized or longer studs in a stroker application, double-check that the studs do not interfere with the cooling fins on your cylinders. In some high-displacement builds, minor clearancing of the cylinder fins may be required to ensure the studs pass through smoothly without binding.