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This ARP performance fastener, stud, bolt, tool, or assembly is the Cylinder Head Studs for BMC 2.1L TR4, 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 Construction: High-strength alloy heat-treated to 190,000 PSI tensile strength for durability in demanding conditions.
- 8740 chromoly steel heat-treated to 190,000 PSI with black oxide finish.
- Post-Heat-Treat Thread Rolling: Increases fatigue strength by 2000% compared to pre-heat-treat threading for longer service life.
- 12-Point Nuts Included: Provide secure, high-torque fastening with black oxide finish for corrosion resistance.
- MPN 206-4207 made in USA for exact fit on BMC 2.1L TR4 engines.
- Black oxide finish protects against rust in engine environments.
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 | 206-4207 |
| Product Type | Head Stud & Bolt Kits |
| Condition | New |
| Configuration | Cylinder Head Studs for BMC 2.1L TR4, 12-pt Nuts |
| 8740 Chrome Moly Construction | High-strength alloy heat-treated to 190,000 PSI tensile strength for durability in demanding conditions |
| Centerless Ground | Precision machining ensures concentricity so cylinder heads and gaskets align perfectly every time |
| Post-Heat-Treat Thread Rolling | Increases fatigue strength by 2000% compared to pre-heat-treat threading for longer service life |
| Undercut Design on Shorter Studs | Equalizes stretch across all studs for uniform clamping and resistance to gasket blowout |
| 12-Point Nuts Included | Provide secure, high-torque fastening with black oxide finish for corrosion resistance |
| Q | Which Triumph models does ARP 206-4207 fit? A: Fits 1961-1967 TR4 and 1965-1967 TR4A with BMC 2.1L (2138cc) engines |
| Method | UPS Ground or FedEx |
| Availability | In stock - ships same or next business day |
| Packaging | ARP retail box 11 x 7 x 1.5 inches |
| Weight | 2 lbs |
| Chrome Moly Construction | High-strength alloy heat-treated to 190,000 PSI tensile strength for durability in demanding conditions |
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.
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Frequently Asked Questions
How do I confirm the Cylinder Head Studs for BMC 2.1L TR4, 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
- Confirm ARP part number 206-4207, 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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