ARP Cylinder Head Studs for BMC A Series, 9 studs 12-pt Nuts

This ARP performance fastener, stud, bolt, tool, or assembly is the Cylinder Head Studs for BMC A Series, 9 studs 12-pt Nuts. 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

• 8740 Chrome Moly Alloy: Heat-treated to 190000 PSI tensile strength ensures complete penetration and durability far beyond standard studs.
• Thread Rolled After Heat-Treat: Provides 2000% higher fatigue strength compared to pre-heat-treat threading for long-term reliability.
• 12-Point Nuts and Black Finish: Secure fastening with corrosion resistance made in USA with ARP stamp for authenticity.
• Chase blind holes with 14mm x 1.5 tap remove all debris before installing studs.
• 8740 Chrome Moly alloy black oxide finish for strength and corrosion protection threads rolled post-heat-treat.

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
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• ARP 02-06 Mini Cooper Head Bolt Kit
• ARP 02-06 Mini Cooper S Head Stud Kit

Frequently Asked Questions

How do I confirm the Cylinder Head Studs for BMC A Series, 9 studs 12-pt Nuts 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 206-4201, 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.