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This ARP performance fastener, stud, bolt, tool, or assembly is the BMC A Series Main Stud Kit. 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
- Thread, length, material, strength series, and included quantity are exact-part specific
- Engine, vehicle, component, and installation requirements must match the current ARP application
- These 8740 chrome-moly studs deliver 190,000 psi tensile strength with black oxide finish for precise clamping force and alignment under high-RPM street race and rally loads.
- Precision-ground and heat-treated with rolled threads this kit replaces factory bolts directly without block modifications.
Fitment
| Years | Make | Model | Application |
|---|---|---|---|
| Universal or specification-matched application. Verify every dimension, interface, load or operating requirement, and listing note. | |||
Specifications
| Brand | ARP |
|---|---|
| Manufacturer Part Number | 206-5401 |
| Product Type | Main Stud & Bolt Kits |
| Condition | New |
| Configuration | BMC A Series Main Stud Kit |
| 8740 Chrome-Moly Construction | 190,000 psi tensile strength holds crankshaft securely during extreme high-RPM operation |
| Black Oxide Finish | Rolled threads after heat treatment resist fatigue and protect against corrosion |
| Included Hardware | Parallel-ground washers and 12-point nuts distribute load evenly across all five main caps |
| Bolt-In Fitment | Direct replacement for factory main bolts in stock or modified A-Series blocks |
| Complete Kit | 10 studs 10 washers and 10 nuts cover full engine installation needs |
| Q | Fits 1275cc Cooper S? A: Yes fits all BMC A-Series engines 948cc to 1293cc including Cooper S |
| Method | UPS or FedEx Ground |
| Availability | In stock - ships same or next business day |
| Packaging | Protective retail box 8 x 6 x 1.5 inches |
| Weight | 1 lb |
| Chrome-Moly Construction | 190,000 psi tensile strength holds crankshaft securely during extreme high-RPM operation |
What's Included
One new ARP main 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 03 Mazda 2.3L DOHC 16V Main Stud Kit
- ARP 03-06 Mitsubishi Evo Main Stud Kit
- ARP 06+ Chevy Duramax Diesel LBZ/LMM Main Stud Kit
Frequently Asked Questions
How do I confirm the BMC A Series Main 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
- Confirm ARP part number 206-5401, the complete application, and every required supporting component before beginning work.
- Clean and inspect all mating threads and components, then verify thread engagement, length, washers, nuts, lubricant, and required preparation before assembly.
- Follow ARP's current tightening sequence, lubricant instructions, torque or stretch method, and any retorque procedure for this exact part.
- Verify clearance, preload, fastener seating, and normal component operation before returning the vehicle or engine to service.
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