ARP 201-4305 Head Stud Kit for 1985-1991 BMW E30/E34 M20 2.5L

Vehicle Fitment

• 1985-1991 BMW E30 325i, 325is, 325iX (M20 2.5L 6-Cyl)
• 1989-1990 BMW E34 525i (M20 2.5L 6-Cyl)

Features

• High-performance ARP Pro Series head stud kit
• Cold-forged 8740 chrome moly steel construction
• Heat-treated to 200,000 psi tensile strength
• Centerless ground for precision and concentricity
• Thread-rolled after heat treatment for superior fatigue strength
• Black oxide finish for enhanced corrosion resistance
• Includes hardened parallel washers for uniform load distribution
• Designed for high-performance and racing applications

Specifications

• Socket Size: 12mm 12-point, 4mm Allen
• Material: 8740 chrome moly steel
• Tensile Strength: 200,000 psi
• Finish: Black oxide
• Includes: 12 studs, 12 nuts, 12 washers

Included Components

• 12x ARP head studs
• 12x ARP nuts
• 12x ARP hardened washers
• 1x ARP Ultra-Torque assembly lubricant

Product Description

The ARP 201-4305 Cylinder Head Stud Kit is engineered for BMW's M20 2.5L 6-cylinder engines, specifically the 1985-1991 E30 325i, 325is, 325iX, and the 1989-1990 E34 525i. This kit replaces the factory head bolts with high-performance ARP studs, providing superior clamping force and improved sealing under high boost or high compression conditions.

Constructed from premium 8740 chrome moly steel, each stud is cold-forged, heat-treated to 200,000 psi tensile strength, and centerless ground for precision. The studs are thread-rolled after heat treatment, enhancing fatigue strength. The black oxide finish offers added corrosion resistance, ensuring longevity even in harsh conditions.

Ideal for performance enthusiasts and racers, this kit includes all necessary hardware: 12 studs, 12 nuts, 12 hardened washers, and ARP Ultra-Torque assembly lubricant. Whether you're rebuilding your engine or upgrading for performance, the ARP 201-4305 kit ensures a secure and reliable cylinder head attachment.