SKU: 206-4207 | UPC: 672036020064
ARP Cylinder Head Studs for 1961-1967 Triumph TR4/TR4A BMC 2.1L, 12-pt Nuts
ARP Pro Series cylinder head stud kit 206-4207 fits BMC 2.1L engines in 1961-1967 Triumph TR4 and TR4A models. These studs deliver consistent clamping force to maintain head gasket integrity under high compression and boost. Professional engine builders choose them for racing and street performance builds.
Key Features
- 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
Product Notes
- MPN 206-4207 made in USA for exact fit on BMC 2.1L TR4 engines
- Black oxide finish protects against rust in engine environments
- Packaged in protective ARP box measuring 11 x 7 x 1.5 inches
Installation Notes
- Professional installation recommended.
- Apply ARP thread lubricant to studs and nuts for accurate torque
- Compatible with stock or performance head gaskets. torque to ARP specifications
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 1961-1967 | Triumph | TR4 | 2.1L |
| 1965-1967 | Triumph | TR4A | 2.1L |
Why Choose ARP?
- Choice of top professional engine builders in racing
- Premium alloys and processes exceed industry standards
- Exact tolerances for flawless head installation and sealing
Frequently Asked Questions
- Q: Which Triumph models does ARP 206-4207 fit?
A: Fits 1961-1967 TR4 and 1965-1967 TR4A with BMC 2.1L (2138cc) engines - Q: What material and strength rating?
A: 8740 chromoly steel heat-treated to 190,000 PSI with black oxide finish - Q: What is the warranty and installation tip?
A: Limited warranty against manufacturing defects. use ARP lube and follow torque specs for best results
Shipping & Handling
- 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
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