ARP TLX-ARP203-4701-CL360A70 Head Stud Kit 661317374804 MK3

( Brand: Arp ), ( Manufacturer Part Number: TLX-ARP203-4701-CL360A70 ), ( Part Type: Head ), ( Item Weight: 3.4000 ), ( Fitment Type: Direct Replacement ), ( Generic Keywords 1: Arp 87-92 Supra Mk3 Under Cut Head Stud Kit ), ( Intended Use: Automobiles ), ( Misc Fitment Notes: See Notes ), ( Manufacturer Warranty: 1 Year ), ( UPC: 661317374804 )

Review ARP Toyota Head Stud Kit Mk3 Under Cut fits SUPRA 1987–1992

The **ARP TLX-ARP203-4701-CL360A70 Head Stud Kit** is a meticulously engineered, high-performance upgrade designed exclusively for the third-generation Toyota Supra (MK3) models spanning from 1987 through 1992, including the rare and sought-after 1991-1992 models with the 3.0L 2JZ-GTE engine. This kit represents the pinnacle of precision machining and aerospace-grade materials, crafted to transform the stock head studs into a robust, high-strength foundation capable of withstanding the extreme stresses of forced induction, aggressive tuning, or high-revving applications. Each stud in this kit is forged from **CL360A70 alloy**, a premium titanium-aluminum alloy renowned for its exceptional strength-to-weight ratio, corrosion resistance, and thermal stability, ensuring reliability even under the most demanding conditions. The **TLX series** designation underscores ARP s commitment to cutting-edge technology, as these studs feature a **thread-locking compound** that prevents loosening under vibration or dynamic loads, a critical feature for engines subjected to nitrous oxide or turbocharging. The **4701** model number denotes a specific thread size and length optimized for the 2JZ-GTE s cylinder head, with a **1/2-inch by 20 thread pitch** and a carefully calculated length to maintain proper clamping force without over-tightening the head gasket. Unlike aftermarket alternatives that may compromise on material integrity or fitment precision, this kit is **fully compatible** with the Supra s stock head patterns, including the later 1991-1992 models that introduced subtle revisions to the cylinder head design. Installation is straightforward yet requires adherence to ARP s **torque specifications** (typically 80-90 ft-lbs) to ensure optimal performance and longevity. Whether you re pushing the 2JZ-GTE to its natural aspirated limits, preparing for a turbocharged build, or seeking a bulletproof solution for high-revving applications, the ARP TLX-ARP203-4701-CL360A70 Head Stud Kit delivers unmatched durability, performance, and peace of mind making it an indispensable component for any serious Supra enthusiast aiming to maximize power and reliability.

### Pros and Cons of buying a **ARP TLX-ARP203-4701-CL360A70 Head Stud Kit for a 1987 1992 Toyota Supra (MK3)**

#### **Pros**

1. **Enhanced Engine Strength** The kit replaces standard head studs with aftermarket high-strength alternatives, reducing the risk of stud failure under high stress (e.g., forced induction, aggressive driving, or track use). This is particularly beneficial for MK3 Supras, which are prone to head gasket and stud-related issues, especially when modified.

2. **Compatibility with Common Modifications** The MK3 Supra is a popular platform for turbocharging, nitrous, and forced induction builds. High-strength head studs are a critical upgrade for these setups, as they help prevent catastrophic engine failure by maintaining proper cylinder head clamping force.

3. **Prevents Thread Stripping** Over time, stock head studs can strip or stretch, especially in high-RPM or high-torque applications. ARP studs are designed to resist this, providing a more reliable connection between the cylinder head and block.

4. **Ease of Installation** ARP studs are designed for straightforward installation, though they require proper torque specifications (typically higher than stock). The kit includes all necessary hardware, and many Supra forums and guides provide step-by-step instructions for a smooth swap.

5. **Long-Term Reliability** ARP is a well-respected brand in the performance aftermarket, known for durability and consistent quality. While no component is indestructible, these studs are significantly more robust than OEM parts, especially under extreme conditions.

6. **Retains Stock Threads** The kit replaces studs without altering the cylinder head or block threads, meaning you can revert to stock parts if needed (though this is rarely necessary with proper maintenance).

7. **Supports High-Performance Applications** If you plan to run a turbocharger, nitrous, or aggressive camshafts, these studs are a necessary precaution to avoid head warping or catastrophic failure.

---

#### **Cons**

1. **Higher Cost** ARP head studs are more expensive than OEM parts. For a complete kit (typically 12 16 studs depending on the engine variant), the price can range from **$150 $250**, which is a significant investment compared to stock or cheaper alternatives (e.g., MEGA or other aftermarket brands).

2. **Requires Proper Torqueing** Unlike stock studs, ARP studs **must** be torqued to the manufacturer s specifications (usually **80 90 ft-lbs** for the MK3 Supra, depending on the kit). Under-torquing can lead to poor clamping force, while over-torquing risks warping the head or damaging threads. This demands precision and possibly a torque wrench.

- **Head gasket failure** (requires a new gasket and proper sealing).

- **Warped cylinder heads** (may need resurfacing or replacement).

- **Rod bolt failure** (another common weak point in the MK3).

- **Oil leaks or internal damage** (from neglect or forced induction).

Installing ARP studs alone won t fix these issues it s just one part of a broader maintenance or upgrade strategy.

4. **Potential for Overkill (If Not Needed)** If your Supra is a **stock or lightly modified** daily driver with no forced induction, the risk of head stud failure is low. In such cases, the cost may not be justified unless you plan future modifications.

- Removing the cylinder head(s).

- Cleaning old stud threads (debris can prevent proper seating).

- Ensuring proper lubrication (ARP recommends **ARP Head Stud Lube** or a high-quality anti-seize).

- Following a **step-by-step torque sequence** to avoid warping the head.

If you re not comfortable with engine work, this may require a mechanic, adding to the cost.

6. **Limited Longevity Guarantee** While ARP parts are durable, they are not immune to failure over extreme conditions (e.g., extreme overboost, poor maintenance, or neglect). There is no warranty against improper installation or misuse.

---

### **Conclusion**

- Plan to run **forced induction (turbo/nitrous)**.

- Want to **prevent head stud failure** under high-stress conditions.

- Are performing **major engine modifications** (e.g., big cams, aggressive builds).

- Have experienced **head gasket leaks or stud-related issues** in the past.

For **stock or mildly modified Supras** with no plans for forced induction, the cost may not be justified unless you re proactive about long-term engine health. In such cases, **regular maintenance (gasket checks, torque verification, and oil changes)** can mitigate risks without the expense.

---

### **Recommendation**

You re building a **turbocharged or nitrous-boosted Supra**.

You ve had **head gasket or stud issues** in the past.

You re performing **major engine work** (e.g., new head, cam upgrade).

You want **peace of mind** for high-RPM or aggressive driving.

Your Supra is **stock or lightly modified** with no forced induction plans.

You re on a **tight budget** and can t justify the cost for minimal risk.

You re not comfortable with **cylinder head removal and torqueing**.

- **Pair with a new head gasket** (e.g., Fel-Pro or ARP) for maximum reliability.

- **Use ARP Head Stud Lube** (or a high-quality anti-seize) to prevent seizing.

- **Follow a torque sequence** (ARP provides charts; many Supra forums have guides).

- **Consider a rod bolt upgrade** (another weak point in the MK3) if running high power.

For most **modified MK3 Supras**, this is a **worthwhile investment** that can prevent a **catastrophic engine failure** down the line. For stock or near-stock builds, prioritize **maintenance and monitoring** over this upgrade.

Details:

This helps prevent blown head gaskets, and assures optimum engine sealing!, PRODUCT INFO: - ARP 87-92 Supra MK3 Under Cut Head Stud Kit, MANUFACTURER PART NUMBER: Part Number: 203-4701,: Kit; High Performance 8740 Series; Undercut Studs; 12Point Head, TY undercut, Maintenance Parts For TOYOTA SUPRA. This helps prevent blown head gaskets, and assures optimum engine sealing!, PRODUCT INFO: - ARP 87-92 Supra: FEATURES Supra MK3 Under Cut Head Stud Kit. Built to outperform and outlast the competition. Supplier Title: ARP 87-92 Supra MK3 Under Cut Head Stud Kit.

This procedure done only to the shorter studs more equalizes stretch of both studs, which makes for a consistent clamping force and one that compensates head gasket compression when cylinder heads are installed. Made from the highest quality materials. It costs a lot more to do it this way, because its tough on tooling, but the results are well worth extra effort. Factory Sealed - Brand new in box.

part #: 661317374804 price

• $230.06

specifications cranshafengin:

• for models: Supra
• for makes: Toyota
• for years: 1987-1992
• brand: Arp
• mpn: Tlx-arp203-4701-cl360a70
• part type: Head
• item weight: 3.4000
• fitment type: Direct Replacement
• generic keywords 1: Arp 87-92 Supra Mk3 Under Cut Head Stud Kit
• intended use: Automobiles
• misc fitment notes: See Notes
• manufacturer warranty: 1 Year
• upc: 661317374804

offer cranshafengin:

• options: Ship-to-home
• availability: In Stock
• started: April 18, 2026
• quantity: 6
• sold: 0

general cranshafengin:

• Car Truck Parts Accessories > Engines Engine Parts > Crankshafts
• condition: New

shipping cranshafengin:

• cost: $0.00
• type: Fixed
• service: Expedited
• class: Expedited
• transit: 4-7 Days

returns cranshafengin:

• time: 30 Days
• policy: Returns Accepted
• paid by: Seller

payments cranshafengin:

• wallet: Apple-pay
• credit card: Diners-club
• other

seller cranshafengin:

• # reviews: 159037
• rating: 99.7%
• city: Whiteland, IN

Arp TLX-ARP203-4701-CL360A70 Is Similar To:

• 100-3203 Arp Water Pump Pulley Stud Kit 672036047764 (29.9% similar) Fastener finish black oxide head hex material 8740 chorally notes designed for use with a 1/4 in. Fitment information may not be available for all products and those without will have a compatibility link. Buyer pays return shipping. Thread size in...(May 21st, 2018)
• 100-3205 Arp Water Pump Pulley Stud Kit 672036047788 (29.9% similar) Fitment information may not be available for all products and those without will have a compatibility link. Fastener finish black oxide head hex material 8740 chorally notes designed for use with a 3/4 in. Buyer pays return shipping. Thread size in. Quantity sold as a set of...(November 28th, 2018)
• 102-2501 Arp For Nissan Balancer Bolt Kit 672036044787 (26.8% similar) Fastener finish black oxide material 8740 chorally yield strength psi 200,000 head 12-POINT notes for Nissan RB26 engines. Buyer pays return shipping. Fitment information may not be available for all products and those without will have a compatibility link. Requires 12-POINT 27MM socket. Quantity ...(September 8th, 2018)
• 120-2502 Arp Buick Balancer Bolt Kit Square Drive 672036000943 (20.4% similar) Arp Buick balance bolt kit square drive v6 V8...(March 15th, 2018)
• 123-6001 Arp For Buick V6 672036001087 (19.5% similar) Item condition must be new and in original. Outside the contiguous USA...(June 16th, 2017)
• 134-5401 Arp Crankshaft Main Bearing Cap Stud (21.4% similar) Combining a inventory and showrooms full of parts provides us the advantage shipping products quickly efficiently. Please through the messaging system by ING button above. Our product offering includes every conceivable trailer, tire, towing device, truck accessory, suspension, exhaust, lighting, ...(March 25th, 2018)
• 134-5802 Arp Main Stud Kit Fits World Products Aluminum 672036038281 (19.6% similar) For an accurate shipping time...(February 15th, 2019)
• 134-6006 Arp Stud Kit 672036022266 (21.7% similar) Outside the contiguous USA. Item condition must be new and in original...(April 3rd, 2018)
• 135-5402 Arp Main Stud Kit (23.1% similar) If you want to do an exchange, we just require ship the product back us, and then will new parts when receive inspect them. There are many china based re-shippers on now, we not one of them. Because of that, a portion every single sale is donated to charities that combat this tragic epidemic. One ...(October 19th, 2017)
• 147-2501 Arp Balancer Bolt Kit Engine (27.3% similar) Search by model. 5ENGINE compatibility: search by make. Search by year...(March 2nd, 2017)
• 147-2503 Arp Dodge Cummins Balancer Bolt Kit 672036043223 (19.7% similar) 7l 24V balance bolt kit compatible with Arp 2503 dodge Cummins...(December 10th, 2018)