ARP Main Stud Conversion Kit for BMW E46 M3 S54 3.2L – 8740 Chromoly, 200,000 psi Engine Bottom End Main Cap Studs

ARP Main Stud Conversion Kit for BMW E46 M3 S54 3.2L – 8740 Chromoly, 200,000 psi Engine Bottom End Main Cap Studs

£201.25
£201.25
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ARP Main Stud Conversion Kit for BMW E46 M3 S54 3.2

Upgrade the bottom end of your BMW E46 M3 S54 with the ARP Main Stud Conversion Kit. Built from premium 8740 chromoly steel and heat treated in-house to an incredible 200,000 psi tensile strength, these ARP main studs deliver rock-solid clamping force and long-term reliability for performance builds, track days and fast road use. Precision J-form threads are rolled after heat treatment for superior thread integrity, giving a stronger, more durable engagement than standard OEM main bolts. The kit includes hardened parallel-ground washers and aerospace quality nuts for consistent torque and repeatable preload.

If you are rebuilding an S54, chasing reliability at high RPM or simply want proven engine fasteners you can trust, this ARP main stud kit is a must-have. Expect reduced crankshaft flex and less main cap fretting compared with factory hardware, helping to keep bearing clearances stable and the bottom end secure under sustained load.

  • Direct-fit ARP main stud conversion for BMW E46 M3 with S54 3.2 engine
  • 8740 chromoly steel construction with 200,000 psi tensile strength
  • Precision J-form threads rolled after heat treatment for superior strength
  • Includes hardened parallel-ground washers and aerospace quality nuts
  • Improves clamping force and bottom-end rigidity
  • Helps reduce crankshaft flex and main cap fretting
  • Complete hardware for main bolt to stud conversion

Fitment

  • BMW E46 M3 with S54 3.2L engine

What is included

  • Main studs
  • Hardened parallel-ground washers
  • Aerospace quality nuts

Why choose ARP and Nforcd

We use ARP main studs on our own S54 builds and customer cars, and the results have been outstanding. Customers consistently report improved confidence in the bottom end, stable oil clearances and dependable torque retention after heat cycles. ARP fasteners are the industry standard for high performance BMW engine builds, and this kit is the go-to choice for the E46 M3 S54.

Installation and support

Professional installation is recommended for best results, including correct cleaning, lubrication and torque procedures. Want us to fit it for you? Nforcd offers expert installation in Warwickshire. Request a fitting quote at Sales@nforcd.com.

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