ARP 204-5405 Crankcase Bolt Kit 672036035457 3.0L/3.3L 930

( Brand: Arp ), ( Manufacturer Part Number: 204-5405 ), ( Part Type: Bolt ), ( Air Freight Prohibited: False ), ( UPC: 672036035457 )

Review ARP Porsche 3.0l/3.3l Crankcase Thru Bolt Kit 930 fits 1978–1979

The **ARP 204-5405 Crankcase Bolt Kit** is a meticulously engineered aftermarket solution designed exclusively for the high-performance 3.0L and 3.3L air-cooled Porsche 930 Turbo engines from the 1978 to 1979 model years. This premium bolt kit replaces the stock crankcase bolts with high-strength, heat-treated **ARP 18-8 stainless steel** fasteners, engineered to withstand the extreme stresses imposed by aggressive driving, track use, or forced induction modifications. Each bolt in this kit features a **fine-threaded, 18-8 stainless steel construction** with a **12-point drive head**, ensuring optimal torque distribution and resistance to fatigue, stripping, or deformation critical factors when pushing these legendary engines beyond their factory limits. The bolts are precision-machined to ARP s exacting standards, offering superior clamping force and a tighter seal compared to OEM components, which are prone to loosening under high G-forces or thermal cycling. Whether you're preparing your 930 for a weekend track session, a high-speed run on the Autobahn, or a restoration project where reliability is paramount, this kit eliminates the risk of bolt failure, a common concern in high-performance applications. The installation process is straightforward, requiring only the removal of the existing bolts and the application of ARP s recommended thread locker or anti-seize compound to prevent galling. With its uncompromising quality and track-proven performance, the **ARP 204-5405 Crankcase Bolt Kit** is an essential upgrade for any owner seeking to maximize the durability and performance of their 930 s legendary air-cooled engine.

### **Pros and Cons of buying a ARP 204-5405 Crankcase Bolt Kit for a 1978-1979 Porsche 930 (3.0L/3.3L Engine)**

#### **Pros**

1. **Enhanced Engine Strength and Reliability**

The ARP kit replaces the stock crankcase bolts with high-strength, heat-treated bolts designed to handle increased torque and stress. This is particularly beneficial for engines that see high RPM, aggressive driving, or modifications that increase cylinder pressure (such as forced induction or high-performance camshafts). The stock bolts are known to stretch or fail under heavy loads, leading to catastrophic engine damage if the crankcase splits.

2. **Prevents Catastrophic Engine Failure**

A failed crankcase bolt can cause the engine block to fracture, leading to a complete engine wreck. The ARP bolts are engineered to maintain clamping force under extreme conditions, reducing the risk of such failures. This is a critical upgrade for enthusiasts who push their 930s hard, whether on the track or in daily driving with aggressive modifications.

3. **Compatibility with Performance Modifications**

If you plan to add a turbocharger, larger camshafts, or other performance upgrades, the ARP bolts are a necessary precaution. Stock bolts are not rated for the additional stress these modifications impose, and upgrading to ARP ensures the crankcase remains secure.

4. **Easy Installation**

The ARP kit is designed for straightforward installation, requiring only basic tools. The bolts are pre-lubricated with ARP s high-temperature thread locker, and the installation instructions are clear. This makes it a relatively simple DIY project for those comfortable with basic engine work.

5. **Long-Term Cost Savings**

While the upfront cost is higher than stock bolts, the investment prevents expensive engine damage. Replacing a cracked crankcase or block is far more costly than installing ARP bolts, making this a wise long-term financial decision for serious Porsche 930 owners.

6. **Industry Standard for High-Performance Applications**

ARP is a trusted brand in the performance aftermarket, known for manufacturing high-quality, reliable fasteners for engines under extreme stress. Using ARP bolts ensures you re getting a product that meets or exceeds industry standards for durability and performance.

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#### **Cons**

1. **Higher Upfront Cost**

The ARP 204-5405 kit is significantly more expensive than the stock crankcase bolts. For a 930 owner on a tight budget, this may be a substantial investment, especially if the engine is otherwise in good condition and not heavily modified. However, the cost is justified by the potential savings from avoiding an engine failure.

2. **Not Necessary for Stock or Mildly Modified Engines**

If your 930 is running stock or with only minor modifications (such as a mild camshaft or minor tuning), the stock bolts may suffice. In such cases, the ARP kit is an unnecessary expense unless you plan to push the engine harder in the future. Stock bolts are adequate for daily driving and light performance use.

3. **Requires Proper Installation Technique**

While the installation is straightforward, improper torqueing or lubrication can compromise the effectiveness of the bolts. Over-tightening can strip threads or damage the crankcase, while under-tightening may not provide sufficient clamping force. Following ARP s specifications and using a torque wrench is essential to avoid issues.

4. **Limited Availability of Replacement Parts**

ARP bolts are not widely available at every auto parts store, and ordering them may require purchasing from specialty performance retailers or online marketplaces. This could add to the inconvenience if you need to replace a bolt in the future.

5. **Potential for Overkill on Some Applications**

Some 930 owners argue that the stock crankcase is already robust, and the ARP bolts may be overkill unless you re running significant boost or extreme power levels. However, this is a subjective call, and many performance-focused owners prefer the added peace of mind.

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### **Conclusion**

The ARP 204-5405 crankcase bolt kit is a highly recommended upgrade for Porsche 930 owners who plan to push their engines beyond stock specifications, whether through forced induction, aggressive camshafts, or high-RPM driving. The benefits of enhanced reliability, prevention of catastrophic failure, and compatibility with performance modifications far outweigh the higher cost for those who prioritize engine longevity and performance.

For owners with stock or mildly modified engines that are not subjected to extreme stress, the stock bolts may be sufficient, and the ARP kit could be considered an unnecessary expense. However, if you re serious about performance or plan to modify your 930 in the future, the ARP bolts are a wise and cost-effective insurance policy against engine failure.

---

### **Recommendation**

- You plan to add a turbocharger, supercharger, or significant forced induction.

- You re running aggressive camshafts, high-flow heads, or other modifications that increase cylinder pressure.

- You frequently drive at high RPM or subject the engine to heavy loads (e.g., track use, towing, or aggressive daily driving).

- You want to future-proof your engine against potential failures as you add more modifications.

- Your 930 is running stock or with only minor modifications and you have no plans to push it further.

- You re on a tight budget and the engine is otherwise in good condition with no signs of stress.

- You re not comfortable with the installation process or lack the tools to properly torque the bolts.

Ultimately, the ARP crankcase bolt kit is one of the most important performance upgrades for a 930 engine, especially for those who demand reliability and power. It s a small investment that can save you from a very large (and expensive) engine failure down the road.

Details:

Features: High-strength alloy construction for durability. Resists stretching and fatigue for long-lasting performance. Easy to install with precise fitment for reliable engine support. Crafted with high-quality materials, this kit ensures durability and precision in maintaining engine integrity during demanding driving conditions.

Proper installation of these bolts can help prevent engine leaks and ensure proper alignment components, contributing to improved overall health. Includes all necessary bolts for secure assembly. Constructed with Raps renowned manufacturing standards, these bolts feature a high-strength alloy that resists stretching and fatigue. Designed specifically for Porsche 930 1978-1979 model's.

The kit includes all necessary bolts to replace worn or damaged components, helping optimize engine performance and longevity.

part #: 2045405 prices

• $1146.79-$1351.89

specifications cranshafengin:

• for makes: Porsche
• for years: 1978-1979
• brand: Arp
• mpn: 204-5405
• part type: Bolt
• air freight prohibited: False
• upc: 672036035457

offer cranshafengin:

• quantity: 2
• started: May 13, 2026
• availability: In Stock
• sold: 0
• options: Ship-to-home

seller cranshafengin:

• city: Saint Paul, Minnesota
• rating: 98.6%
• # reviews: 45683

general cranshafengin:

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

payments cranshafengin:

• other
• wallet: Google-pay
• credit card: Discover

returns cranshafengin:

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

shipping cranshafengin:

• service: Standard
• type: Fixed
• cost: $0.00
• class: Standard
• transit: 2-5 Days

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