ARP 8740 Main Bearing Stud Conversion Kit for BMW E46 M3 S54 3.2 S54B32 - Engine Block Main Cap Studs & Nuts, Bottom End Rebuild Hardware, 200,000 psi Chromoly Fasteners

Race‑proven main bearing cap stud set for BMW M3 E46 S54B32

Lock down the bottom end of your S54 with this ARP stud and nut set. Manufactured from premium 8740 alloy steel and heat treated to a 200k psi tensile rating, these engine block fasteners deliver exceptional clamping consistency for spirited road use and intensive circuit work. Threads are rolled after heat treatment for superior fatigue resistance and thread integrity, and the kit includes hardened parallel‑ground washers with aerospace grade nuts for reliable and repeatable preload.

Building or refreshing an E46 M3 engine and want dependable main bearing cap hardware you can trust at high rpm? This upgrade is a proven choice. Expect rock solid cap retention, reduced cap fretting and improved stability of bearing clearances under sustained load. We use these on our own S54 builds and customer cars with outstanding results and excellent feedback on longevity and torque retention.

Key details

• Designed for BMW M3 E46 with S54 3.2 litre engine
• 8740 chromoly alloy fasteners with approx 200k psi tensile strength
• J‑form threads rolled after heat treatment for maximum durability
• Includes hardened, parallel‑ground washers and aerospace quality nuts
• Converts factory main bolts to a stud and nut arrangement
• Enhances bottom‑end rigidity and clamping force under high rpm
• Helps mitigate crankshaft flex and main cap movement

Fitment

• BMW E46 M3 S54B32

What you get

• Main bearing cap studs
• Hardened parallel‑ground washers
• Aerospace quality nuts

Why buy from MJ Modifications

We build, maintain and track S54 engines and repeatedly choose these ARP fasteners for their reliability. Owners report improved confidence in the bottom end and stable oil clearances after heat cycles. If you are chasing lasting performance and peace of mind, this is the hardware to fit.

Installation and support

Professional assembly is recommended to ensure correct cleaning, lubrication and torque procedures are followed. Want us to install it for you? MJ Modifications offers expert fitting in Warwickshire. Request a quote at info@mjmodifications.co.uk.

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