ARP BMW 2.3L (S14) 4cyl Head Stud Kit

This ARP performance fastener, stud, bolt, tool, or assembly is the BMW 2.3L (S14) 4cyl Head Stud Kit for 1988-1991 BMW M3. Confirm the exact engine or vehicle application, thread size, length, material, strength series, included quantity, installation lubricant, tightening sequence, and current ARP torque specification before ordering.

Key Features

• ARP2000 Alloy Studs: Rated at 220,000 psi tensile strength to handle extreme boost and nitrous applications without stretching.
• Stud Design: Distributes torque evenly across block threads to prevent damage and ensure repeatable accuracy.
• Precision-Rolled Threads: Provide maximum thread engagement for consistent clamping and resistance to fatigue.
• 12-Point Nuts: Included with hardened washers for precise torque application and secure locking.
• Yes ARP 201-4605 is direct fit for all US-spec 1988-1991 BMW M3 2.3L S14B23 engines including Evolution models.
• ARP2000 proprietary alloy with 220,000 psi tensile strength and black oxide finish for corrosion resistance.

Fitment

Specifications

What’s Included

One new ARP head stud & bolt kit in the exact configuration and quantity identified by this listing. Brackets, wiring, air lines, fittings, switches, fasteners, fitting kits, fluids, covers, and accessories are included only when expressly stated for this exact part.

About ARP

Automotive Racing Products manufactures high-performance studs, bolts, nuts, washers, wheel hardware, assembly tools, and installation lubricants for engine, drivetrain, chassis, and racing applications. Thread dimensions, material, preload method, lubricant, torque, and included quantity remain exact-part specific.

Important Disclosures

• California Proposition 65 warning applies. Review the current manufacturer warning before handling or installation.

Related Parts

• Shop all ARP products
• ARP BMW E46 M3/S54 12pt head stud kit
• ARP BMW M50 2.5L 6-cylinder 12pt Head Stud Kit
• ARP BMW 2.3L (S14) 22mm UHL Flywheel Bolt Kit (Set of 8)

Frequently Asked Questions

How do I confirm the BMW 2.3L (S14) 4cyl Head Stud Kit fits my application?
Match the exact engine family or vehicle, component location, thread diameter and pitch, under-head length, material, strength series, and every current ARP application note.

Can I reuse the factory torque value with this ARP hardware?
Not automatically. Use ARP’s current instructions for the exact part, material, lubricant, tightening sequence, and preload method. Factory torque values may be based on different hardware and friction.

What is included with this ARP kit?
Only the studs, bolts, nuts, washers, lubricant, and tools expressly listed for this exact part number are included. Verify the required quantity before disassembly.

Installation Instructions

1. Confirm ARP part number 201-4605, the complete application, and every required supporting component before beginning work.
2. Clean and inspect all mating threads and components, then verify thread engagement, length, washers, nuts, lubricant, and required preparation before assembly.
3. Follow ARP’s current tightening sequence, lubricant instructions, torque or stretch method, and any retorque procedure for this exact part.
4. Verify clearance, preload, fastener seating, and normal component operation before returning the vehicle or engine to service.