ARP Head Stud Kit 204-3901 – VW / Audi / Skoda / Seat 1.8 Turbo 20V M10

The original cylinder head bolts are torque-to-yield and must be replaced every time they are removed. This not only increases costs but is also inconvenient, especially if the head is removed more than once for diagnostics or additional engine work.

ARP 204-3901 solves this problem with a set of bolts designed for multiple reuse, while also providing higher strength and better protection against damage compared to standard OEM bolts.

ARP uses high-quality 8740 alloy steel, which is significantly stronger than many materials advertised as "aircraft quality." Each bolt is precision heat-treated to 200,000 psi, then centerless ground for maximum geometric accuracy and excellent concentricity.

In small-displacement engines with high compression ratios, as well as engines with forced induction such as turbochargers or superchargers, proper sealing between the cylinder head and the block is absolutely critical. This is where ARP provides a real advantage.

Key Advantages:

• Suitable for VW / Audi / Skoda / Seat 1.8L Turbo 20V M10
• Reusable, unlike factory torque-to-yield bolts
• Higher strength than OEM
• Made from 8740 alloy steel
• Heat-treated to 200,000 psi
• Centerless ground for high precision
• Rolled threads to Mil-S-8879 specification
• Black oxide finish for wear and corrosion protection
• Includes hardened parallel-ground washers for even load distribution and more accurate torque readings

Why is this an important upgrade?

In 1.8T projects with more boost, higher compression, or more significant loads, secure clamping of the head to the block is crucial. ARP bolts provide more reliable sealing and greater security in performance configurations.

Suitable for:

• engine repair and overhaul
• 1.8T tuning projects
• turbocharged engines
• engines with higher compression
• vehicles requiring more reliable fasteners than OEM