ARP Connecting Rod Bolt Pro Head Kit 672036037758 47MM 12-POINT

( Brand: Arp ), ( Part Type: Rod Bolt Head ), ( Air Restricted: No ), ( UPC: 672036037758 )

Review ARP Bmw Connecting Rod Bolt Kit Pro Series 47mm Length 12-point Head fits E46 328I

The **ARP 672036037758 BMW E46 328i Pro Connecting Rod Bolt Kit** represents the pinnacle of high-performance fasteners designed specifically for the demanding demands of BMW s legendary E46 328i engine, particularly when equipped with a **47mm intake valve and 12-point head** configuration. Engineered to surpass the limitations of standard OEM hardware, this kit delivers an unparalleled combination of strength, precision, and reliability, making it an indispensable upgrade for enthusiasts seeking to maximize power output, durability, and performance in their naturally aspirated or forced-induction applications. ARP s **Pro Series** bolts are forged from **17-4PH stainless steel**, a material renowned for its exceptional tensile strength, corrosion resistance, and fatigue endurance, ensuring they can withstand the extreme stresses generated by aggressive engine modifications, high RPM operation, or sustained boost levels. Each bolt in this kit is **heat-treated and precision-machined** to exacting tolerances, featuring a **fine-thread design** that minimizes stress concentrations and enhances clamping force distribution across the rod and crankshaft interface. The **12-point head** provides a superior grip for wrenches, reducing the risk of rounding during installation or removal, while the **ARP s proprietary thread coating** further prevents galling and seizing, even under the most extreme conditions. Whether you re pushing the limits of a turbocharged or supercharged E46, running a high-revving camshaft, or simply aiming to eliminate the risk of catastrophic failure from standard bolts, this kit installs directly over the stock rod bolts, offering a **drop-in replacement** that eliminates the need for modification to the engine or rod itself. Backed by ARP s reputation for uncompromising quality and supported by a **lifetime warranty**, this connecting rod bolt kit is not just an upgrade it s a critical component for those who refuse to compromise on performance or safety.

### **Pros and Cons of buying a ARP 672036037758 BMW Connecting Rod Bolt Kit for E46 328i (Pro 47mm, 12-Point Head)**

1. **High-Strength Material** ARP bolts are made from **A2-70 steel**, which has a significantly higher tensile strength (200,000 PSI) compared to stock bolts (120,000 140,000 PSI). This reduces the risk of bolt failure under high stress, especially in forced induction or high-performance applications.

2. **12-Point Head Design** The **12-point head** provides better torque distribution when using a socket, reducing the chance of rounding the bolt head during installation or removal. This is particularly useful for high-torque applications.

3. **Proper Thread Engagement** The **47mm length** ensures full thread engagement with the crankshaft, improving load distribution and reducing stress concentration at the bolt head.

4. **Heat-Treated for Durability** ARP bolts undergo **heat treatment and shot peening**, which enhances fatigue resistance and prevents premature failure under cyclic loading (common in high-RPM or turbocharged engines).

5. **OEM Replacement Quality** While not identical to OEM bolts, ARP bolts are designed to **match or exceed stock specifications** in terms of thread pitch, shank diameter, and overall fitment, ensuring compatibility without modification.

6. **Warranty & Reputation** ARP is a well-established brand with a **strong reputation for reliability** in high-performance applications. Their bolts are backed by a **lifetime warranty** against failure due to material defects.

7. **Easier Installation/Removal** The **12-point head** and **proper lubrication** (often included) make installation and removal smoother compared to stock bolts, which can seize due to age or corrosion.

8. **Compatibility with Forced Induction** If you plan to **turbocharge or nitrous your E46 328i**, these bolts are a **necessary upgrade** to prevent catastrophic failure under increased cylinder pressures.

9. **No Modifications Needed** Unlike some aftermarket bolts, ARP s **47mm length** fits stock crankshafts without requiring machining or shimming.

10. **Peace of Mind** For high-performance builds, knowing your **connecting rods are secured with industry-leading bolts** reduces the risk of a **catastrophic engine failure**, which can be extremely costly.

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1. **Cost** ARP bolts are **significantly more expensive** than stock or generic aftermarket alternatives. A full kit (typically 8 bolts) can cost **$200 $300**, whereas OEM or budget aftermarket bolts may run **$50 $100**.

2. **Installation Requires Precision** While easier than stock bolts, **improper torque specification** (too high or too low) can still lead to issues. ARP provides **strict torque specs**, and exceeding them can cause **thread stripping or bolt deformation**.

3. **Not a "Drop-In" Replacement for All Engines** While the **47mm length** works for most E46 328i engines, **longer crankshafts (e.g., in some M52TU variants or modified builds)** may require **custom-length bolts**. Always verify fitment before purchase.

4. **Overkill for Stock or Mild Mods** If you re running a **stock or mildly modified engine (e.g., stock turbo, no nitrous, low boost)**, the risk of bolt failure is **extremely low**, making ARP bolts **unnecessary** for most stock or lightly tuned applications.

5. **Torque Tool Required** Proper installation demands a **high-quality torque wrench** (preferably digital) to ensure accurate tightening. Using a cheap or analog wrench can lead to **over-torquing or under-torquing**.

6. **Potential for Over-Tightening** Some builders **over-tighten** ARP bolts due to their high strength, believing they can "handle it." This is **dangerous** exceeding the **specified torque (typically 80 90 ft-lbs for E46)** can **strip threads or deform the bolt head**.

7. **Not a Fix for Other Engine Issues** Replacing bolts **does not address** other potential weak points in the engine, such as **rod bearings, crankshaft journals, or cylinder head bolts**. A full **high-performance engine build** should include multiple upgrades.

8. **Limited Availability of Replacement Parts** While ARP bolts are durable, if one fails (extremely rare), finding a **direct replacement** may be harder than for OEM bolts.

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### **Conclusion & Recommendation**

#### **Who Should Buy This Kit?**

- **Turbocharged E46 328i builds** (especially with **boost >10 psi** or **nitrous**).

- **High-RPM or forced induction applications** where stock bolts are insufficient.

- **Builders prioritizing reliability** and willing to invest in **premium components**.

- **Those who plan long-term high-performance use** and want **industry-leading bolt strength**.

#### **Who Should Skip This Kit?**

- **Stock or naturally aspirated E46 328i owners** with no plans for forced induction.

- **Budget-conscious builders** who can achieve similar reliability with **high-quality OEM or aftermarket bolts** (e.g., **Fel-Pro, Mucoff, or EBC high-strength bolts**).

- **DIYers who lack proper torque tools** or experience with high-performance bolt installation.

- **Those who haven t verified crankshaft length** some engines may require **custom-length bolts**.

If you are **running a turbocharged or high-performance E46 328i**, the **ARP 672036037758 connecting rod bolt kit is a wise investment** it significantly reduces the risk of **catastrophic bolt failure** and is a **standard upgrade in serious builds**. However, if you re **stock or mildly modified**, consider **more affordable alternatives** unless you have specific concerns about bolt strength.

**For most forced induction builds, ARP is the best choice just ensure proper installation with the correct torque and tools.** If budget is a concern, **Fel-Pro or Mucoff high-strength bolts** can be a cost-effective alternative for lower boost applications.

Details:

This set is designed to fit BMW E46 328I model's and ensures proper clamping force for connecting rods, which critical engine longevity efficiency. Features: Pro Series connecting rod bolts designed for high-performance applications. Meets or exceeds OEM specifications for reliable performance. 47mm bolt length for optimal fit in BMW E46 inline-6 engines.

Natural finish provides corrosion resistance and aesthetic appeal. 12-point head for secure torque application and ease of installation. Constructed from durable chorally steel for high tensile strength. Manufactured by ARP, a trusted name in high-performance fasteners, these rod bolts meet or exceed OEM specifications.

Installation of these bolts requires proper torquing procedures to ensure maximum clamping force and reliability. Their natural finish complements the engines appearance while offering corrosion resistance. Crafted from high-strength chorally steel, these bolts are engineered for durability and reliable performance under demanding conditions. Each bolt features a 47mm length and 12-point head design, ensuring secure torque application during assembly.

The chorally construction provides excellent tensile strength and resistance to fatigue, making them suitable for high-performance applications.

specifications pistonrinro:

• for models: E46, 328i
• for makes: Bmw
• brand: Arp
• part type: Rod Bolt Head
• air restricted: No
• upc: 672036037758

general pistonrinro:

• condition: New
• Car Truck Parts Accessories > Engines Engine Parts > Connecting Rods Parts

seller pistonrinro:

• # reviews: 45600
• rating: 98.5%
• city: Saint Paul, Minnesota

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• type: Fixed
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offer pistonrinro:

• sold: 0
• availability: In Stock
• quantity: 3
• started: March 29, 2026
• options: Ship-to-home

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