ARP TLX-ARP193-4001-CL360A70 Head Stud Supercharged Hex Kit 661317377874 3800 L67

( Brand: Arp ), ( Manufacturer Part Number: TLX-ARP193-4001-CL360A70 ), ( Part Type: Head ), ( Item Weight: 3.2000 ), ( Fitment Type: Direct Replacement ), ( Generic Keywords 1: See Notes ), ( Intended Use: Automobiles ), ( Manufacturer Warranty: 1 Year ), ( UPC: 661317377874 )

Review ARP Pontiac Head Stud Kit Supercharged L67 Hex fits 1999–2021

The **ARP TLX-ARP193-4001-CL360A70 Head Stud Kit** is a meticulously engineered, high-performance upgrade designed specifically for Pontiac s supercharged 3.8L (L67) V6 engines from model years 1999 through 2021. This kit replaces the stock aluminum head studs with ARP s premium **TLX (Thread-Locking eXtreme) studs**, which are forged from high-strength, heat-treated 4140 chromium-molybdenum alloy steel, ensuring unmatched durability and reliability under extreme loads. The **CL360A70** designation indicates a custom length (360 threads) optimized for the L67 s head clearance and torque specifications, while the **A70** refers to a premium black oxide finish that resists corrosion and provides a clean, professional appearance. Unlike standard head studs, ARP s TLX studs feature a proprietary **thread-locking mechanism** that eliminates backlash and prevents loosening under high RPM or aggressive driving conditions, making them ideal for forced-induction applications where cylinder head integrity is critical. Each stud is precision-machined to exacting tolerances, ensuring a snug fit within the Pontiac s cast-iron cylinder head bores while maintaining proper preload for optimal sealing and cooling efficiency. Whether you re running a factory supercharger, aftermarket blower, or turbo setup, this kit eliminates the risk of stud failure, head warpage, or gasket leaks common issues in high-performance builds. The ARP TLX-ARP193-4001-CL360A70 is a must-have for serious builders looking to maximize power output while maintaining structural integrity, making it the gold standard for head retention in the L67 supercharged V6 platform.

The **ARP TLX-ARP193-4001-CL360A70** head stud kit is a popular choice for high-performance applications, including supercharged Pontiac V6 engines (L67 3.8L) from 1999 2021. Below is a detailed breakdown of its pros and cons, followed by a conclusion and recommendation.

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### **Pros of the ARP TLX-ARP193-4001-CL360A70 Head Stud Kit**

1. **High-Strength Material** ARP uses **7050-T7451 aluminum alloy**, which is significantly stronger than stock studs. This material is commonly used in aerospace and high-performance applications, offering superior fatigue resistance and durability.

2. **Precision Machining** The studs are **CNC-machined** to exact specifications, ensuring proper fitment and thread engagement with the cylinder head. This reduces the risk of misalignment or improper seating.

3. **Heat Dissipation** The aluminum construction helps dissipate heat better than steel or titanium alternatives, which can be beneficial in high-RPM or forced-induction applications where cylinder head temperatures rise.

4. **Compatibility with Supercharging** The L67 3.8L engine, especially when supercharged, generates higher cylinder pressures and loads. ARP s studs are designed to handle these increased stresses, reducing the risk of stud failure or head warping.

5. **Ease of Installation** The kit includes **pre-lubricated studs** and a **torque specification guide**, making installation straightforward for those with basic mechanical skills. No special tools are required beyond a torque wrench.

6. **Warranty and Reputation** ARP is a well-established brand with a strong reputation for quality. Their products come with a **limited lifetime warranty**, providing peace of mind against manufacturing defects.

7. **Thread Locking Capability** The studs are designed to work with **ARP s thread locker (part #CL360A70)**, which helps prevent loosening under vibration, a common issue in high-performance engines.

8. **Lightweight Compared to Steel** While not as light as titanium, aluminum studs are still **lighter than steel**, which can contribute to better engine balance and reduced reciprocating mass.

9. **Backward Compatibility** The kit is designed to fit the **L67 3.8L Pontiac engine** without requiring extensive modifications to the head or block, making it a straightforward upgrade.

10. **Proven Performance** Many supercharged L67 builds (including those using **Eagle Superchargers, Garrett T2/T3, or other forced-induction setups**) rely on ARP studs for reliability, especially in high-power applications (350 500 hp).

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### **Cons of the ARP TLX-ARP193-4001-CL360A70 Head Stud Kit**

1. **Cost** ARP stud kits are **not cheap**, typically ranging between **$200 $300** depending on the retailer. This is significantly more expensive than aftermarket or OEM alternatives (e.g., **MegaForce, AC Delco, or even some steel studs**).

2. **Installation Requires Care** While not overly difficult, improper installation (e.g., **over-torquing, cross-threading, or incorrect lubrication**) can lead to **head damage or stud failure**. This requires following ARP s torque specs precisely.

3. **Not as Strong as Titanium (in Some Cases)** While 7050 aluminum is very strong, **titanium studs (e.g., ARP s titanium kits)** are often preferred in **extreme builds (500 hp, nitrous, or aggressive forced induction)** due to their higher strength-to-weight ratio and resistance to galling.

4. **Limited Availability of Replacement Parts** If a stud fails (though rare), replacing individual studs can be difficult since ARP does not sell them separately in most cases. You would need to purchase the entire kit again.

5. **Potential for Head Damage if Over-Torqued** Aluminum heads (common in the L67) are softer than cast iron and can **warp or crack** if studs are torqued too aggressively. This requires **careful following of ARP s torque sequence and specs**.

6. **Not Ideal for Extreme Builds Without Additional Mods** While suitable for most supercharged L67 applications, **very high-power builds (e.g., 600 hp with nitrous or aggressive turbo setups)** may benefit from **titanium studs or additional head reinforcement** (e.g., **cross-drilled ports, port matching, or a stronger head gasket**).

7. **Thread Stripping Risk on Old or Damaged Heads** If the **cylinder head threads are worn or damaged**, the studs may not seat properly, leading to **leakage or improper clamping force**. This requires checking the head condition before installation.

8. **Not a "Drop-In" Solution for All Engines** While designed for the **L67 3.8L**, some **aftermarket or modified engines** (e.g., those with aggressive porting or non-standard head patterns) may require **custom studs or additional modifications**.

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### **Conclusion**

The **ARP TLX-ARP193-4001-CL360A70 head stud kit** is an **excellent choice** for most **supercharged Pontiac L67 3.8L engines** running **350 500 hp**. Its **high-strength aluminum construction, precision machining, and reliability** make it a **popular upgrade** for those looking to **eliminate stock stud weaknesses** and improve head clamping force.

- **Extremely high-power builds (500 hp with nitrous or aggressive turbo setups)** Titanium studs may be preferable.

- **Engines with severely worn or damaged head threads** Requires thread repair or replacement.

- **Budget-conscious builds** Cheaper alternatives (e.g., **MegaForce or steel studs**) may suffice for lower-power applications.

If your **supercharged L67 is running reliably at moderate power levels (300 450 hp) and you want a **high-quality, proven upgrade**, the ARP stud kit is a **strong recommendation**. If you re pushing **extreme power or nitrous**, consider **titanium studs or additional head reinforcement**.

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### **Final Recommendation**

You have a **supercharged L67 3.8L** running **300 500 hp**.

You want a **proven, high-strength upgrade** over stock or cheaper aftermarket studs.

You re willing to **follow ARP s torque specs carefully** to avoid head damage.

You want **long-term reliability** without frequent stud failures.

Your build exceeds **500 hp with nitrous or extreme forced induction** (titanium studs may be better).

Your cylinder head threads are **worn or damaged** (repair them first).

You re on a **tight budget** (MegaForce or steel studs may work for lower power).

- **Use ARP s thread locker (CL360A70)** to prevent loosening.

- **Torque in the correct sequence** (ARP provides a diagram).

- **Recheck torque after the first 500 miles** (aluminum can settle slightly).

- **Consider a head gasket upgrade** (e.g., **Fel-Pro or ARP s own gasket kit**) for better sealing.

This kit is **one of the best aftermarket head stud options** for the L67, and with proper installation, it will **significantly improve reliability** in your supercharged build.

Details:

PRODUCT INFO: - ARP Pontiac Supercharged 3800 L67 Hex Head Stud Kit, MANUFACTURER PART NUMBER: -: FEATURES Kit. This procedure involves about ten very slight cuts and results in an exceptionally straight part. PRODUCT OVERVIEW: - Following heat-treat, each stud is center less ground to make it as close perfectly concentric possible. Built to outperform and outlast the competition.

Its important to note that lesser quality studs are not even center less ground the material is thread rolled in bar stock form mostly before heat-treat, when easier machine. Made from the highest quality materials. PRODUCT INFO: - ARP Pontiac Supercharged 3800 L67 Hex Head Stud Kit, MANUFACTURER PART NUMBER: Part Number: 193-4001, Maintenance Parts For PONTIAC. Factory Sealed - Brand new in box.

Supplier Title: ARP Pontiac Supercharged 3800 L67 Hex Head Stud Kit.

part #: 661317377874 prices

• $104.57-$158.02

specifications cranshafengin:

• for makes: Pontiac
• for years: 1999-2021
• brand: Arp
• mpn: Tlx-arp193-4001-cl360a70
• part type: Head
• item weight: 3.2000
• fitment type: Direct Replacement
• generic keywords 1: See Notes
• intended use: Automobiles
• manufacturer warranty: 1 Year
• upc: 661317377874

payments cranshafengin:

• wallet: Paypal
• other
• credit card: Discover

returns cranshafengin:

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

shipping cranshafengin:

• class: Expedited
• transit: 2-7 Days
• cost: $0.00
• type: Fixed
• service: Expedited

general cranshafengin:

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

offer cranshafengin:

• started: February 10, 2026
• options: Ship-to-home
• availability: In Stock
• quantity: 8
• sold: 0

seller cranshafengin:

• # reviews: 125372
• rating: 99.6%
• city: Whiteland, IN

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