Strengthen the bottom end of your Mazda engine with the ARP 218-5401 Main Stud Kit, engineered to provide superior main cap retention, improved bearing alignment, and exceptional durability for high-performance applications. Designed specifically for Mazda 4-cylinder engines, this kit is an ideal upgrade for engine rebuilds, turbocharged setups, and racing engines where reliable clamping force is essential.

Manufactured from high-strength chromoly steel, each main stud is precision-machined to ARP's exacting standards and finished with a black oxide coating for enhanced corrosion resistance. The kit includes 12-point nuts and hardened washers to ensure consistent torque retention and secure fastening under high RPM and heavy engine loads.

Whether you're building a performance street engine or a dedicated race engine, the ARP 218-5401 Main Stud Kit delivers the strength, precision, and reliability trusted by professional engine builders worldwide.

Features

• High-strength chromoly steel construction
• Precision-engineered for Mazda 4-cylinder engines
• Improves main cap alignment and clamping force
• Black oxide finish for corrosion resistance
• Includes 12-point nuts for secure fastening
• Helps maintain bearing stability under high RPM
• Ideal for engine rebuilds, turbocharged, and racing applications

Specifications / Attributes

• Brand: ARP
• Manufacturer Part Number: 218-5401
• Product Type: Main Stud Kit
• Material: Chromoly Steel
• Nut Style: 12-Point
• Main Configuration: 2-Bolt Main
• Finish: Black Oxide
• Washers Included: Yes
• Application: Main Bearing Caps
• Engine Type: Mazda 4-Cylinder