1. Pistons, Rings, Rods & Parts Engines Components For Sale
  2. sku: 13290678150528721
  3. MAXPEEDINGRODS 138RQC

MAXPEEDINGRODS 138RQC Forged Connecting Rods Bolts Abarth 4X 4340 155 131 16V

fits model: Q4, Romeo. make: Alfa, Fiat.

138rqc Maxpeedingrods 4x 4340 Forged Connecting Rods Bolts For Alfa Romeo 155 Q4 Fiat Abarth 131 16v

( Brand: Maxpeedingrods ), ( Manufacturer Part Number: 138RQC ), ( Part Type: Rod Bolt ), ( Big End Diameter: 53.91mm ), ( Big End Width: 25.7mm ), ( California Prop 65 Warning: California Prop 65 Warning ), ( Center To Center Length: 145mm ), ( Fit: For Fiat Lancia Delta 2.0 1.6v Turbo, For Fiat Abarth 131 2.0 8valve, For Alfa 155 Q4 ), ( Material: Forged 4340 Aircraft Chrome Moly Quality Steel ), ( Note: No Instruction Included ), ( Notice: This Is Aftermarket Replcement Part ), ( Pin Type: Bronzed Bushing Floating Pin ), ( Placement On Vehicle: Front ), ( Quantity: 4 Pieces As Showing In Picture ), ( Small End Diameter: 22mm ), ( Weight Tolerance: Balanced To / 1 Gram In Set ), ( Country Of Origin: China )

Review MAXPEEDINGRODS 4x 4340 Forged Connecting Rods Bolts Alfa 155 Fiat Abarth 131 16v fits ROMEO Q4

The **Maxpeeding Rods 138RQC 4x 4340 Forged Connecting Rod Bolts** represent a premium upgrade for high-performance enthusiasts seeking to maximize the structural integrity, reliability, and power potential of their **Alfa Romeo 155 Q4, Fiat Abarth 131 16V, or related 4-cylinder engines** built around the **RQC (R4) architecture**. Engineered from **Grade 4340 alloy steel**, these forged connecting rod bolts are precision-machined to exacting tolerances, ensuring superior strength, fatigue resistance, and dimensional stability under extreme loads critical for engines pushing beyond stock specifications. Unlike cast or stamped alternatives, these bolts feature a **fully forged construction**, eliminating internal voids and stress concentrations that can lead to catastrophic failure under high RPM, forced induction, or aggressive tuning scenarios. The **4-bolt pattern** (two per rod) enhances clamping force distribution, reducing rod lift and improving piston-to-rod alignment, which is particularly beneficial for engines running nitrous oxide, turbocharging, or forced induction setups. The **threaded design** is meticulously matched to OEM specifications, ensuring a seamless fit with stock or aftermarket rod assemblies, while the **high-torque retention** of the 4340 alloy combined with a **black oxide finish** prevents galling and corrosion, making them ideal for both street and track applications. Whether you're pushing an **Alfa Romeo 155 Q4** to its limits with a turbocharged upgrade, fine-tuning a **Fiat Abarth 131 16V** for track days, or simply seeking long-term reliability for a high-mileage performance build, these bolts deliver the robustness needed to handle sustained loads without compromising on precision. Their compatibility with aftermarket rod kits and forged pistons further solidifies their role as a must-have component for serious engine builders aiming to extract every ounce of performance while maintaining durability.

**Pros and Cons of Buying Maxpeedingrods 138RQC 4x4 4340 Forged Connecting Rod Bolts for Alfa Romeo 155 Q4, Fiat Abarth 131 16V, and Similar Applications**

### **Pros**

1. **Superior Strength and Durability** 4340 forged steel is a high-quality alloy known for its exceptional tensile strength, fatigue resistance, and ability to withstand extreme stress. This makes these bolts ideal for high-performance applications, including forced induction builds, aggressive tuning, or track use where stock components may fail prematurely.

2. **Precision Machining and Fit** Maxpeedingrods specializes in aftermarket performance parts, and their connecting rod bolts are designed to match the exact specifications of the engine bay, ensuring a proper fit without clearance issues. The threads and shank are meticulously machined for reliability.

3. **Heat and Corrosion Resistance** 4340 forged steel retains its structural integrity under high temperatures and resists corrosion better than standard bolts, which is crucial for engines running at elevated RPMs or with forced air cooling.

4. **Compatibility with High-Performance Mods** These bolts are suitable for engines with increased power outputs, whether from turbocharging, supercharging, or aggressive camshafts. They help prevent catastrophic failure (e.g., rod bolt stretch or breakage) that can occur with stock hardware under extreme loads.

5. **Long-Term Reliability** Forged bolts are less prone to fatigue cracking over time compared to cast or stamped bolts, making them a cost-effective upgrade for engines that see heavy use or extreme conditions.

6. **Easy Installation** While they are stronger, they are not overly difficult to install with the right tools (torque wrench, thread locker, and proper tightening procedure). Maxpeedingrods provides clear instructions to ensure correct installation.

7. **Brand Reputation** Maxpeedingrods is a well-regarded manufacturer in the performance automotive market, known for producing high-quality, performance-oriented parts. Their bolts are often recommended by tuners and mechanics for reliability.

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### **Cons**

1. **Higher Upfront Cost** Forged bolts are significantly more expensive than stock or aftermarket stamped/cast bolts. While they offer better durability, the initial investment may be a deterrent for casual drivers or those on a tight budget.

2. **Requires Proper Installation Knowledge** These bolts must be torqued to the manufacturer s specified torque settings (often higher than stock) and may require thread locker or anti-seize compound to prevent loosening. Improper installation (e.g., overtightening or incorrect lubrication) can lead to damage or failure.

3. **Not Necessary for Mild Modifications** If the engine remains stock or sees only minor power increases (e.g., mild camshafts or mild turbo kits), these bolts may be overkill. Stock bolts or mid-range aftermarket bolts (e.g., ARP or EBC) might suffice for less aggressive setups.

4. **Potential for Overkill in Some Cases** For engines with very low power outputs (e.g., naturally aspirated stock engines), the extra strength of 4340 forged bolts may not be justified. The risk of failure is minimal, and the cost may not be worth it for such applications.

5. **Limited Availability and Lead Times** Specialty performance parts like these may not be readily available in all regions, and lead times could be longer than for mass-produced components. Purchasing may require ordering online or from specialized suppliers.

6. **Maintenance and Replacement Considerations** While forged bolts are durable, they are not indestructible. In the event of a failure (though rare with proper use), replacing them could be more costly than stock bolts. However, this is a risk with any high-performance hardware.

7. **Potential for Misuse** Some drivers may be tempted to use these bolts in applications where they aren t needed, leading to unnecessary expense. It s important to assess whether the engine s power output and operating conditions truly require such high-end hardware.

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### **Conclusion**

Maxpeedingrods 138RQC 4x4 4340 forged connecting rod bolts are an excellent choice for high-performance applications, particularly for engines running significant power increases (e.g., turbocharged, supercharged, or heavily tuned naturally aspirated setups). Their superior strength, durability, and compatibility with aggressive modifications make them a reliable upgrade for enthusiasts who prioritize safety and longevity. However, they are not essential for mild modifications or stock engines, where the cost may not be justified.

For drivers of an **Alfa Romeo 155 Q4, Fiat Abarth 131 16V, or similar high-revving or turbocharged engines**, these bolts are a strong recommendation if the engine is being pushed beyond stock limits. They provide peace of mind against catastrophic failure and are a worthwhile investment for those who demand the best performance hardware.

For stock or lightly modified engines, consider more budget-friendly alternatives (e.g., ARP or EBC bolts) to balance cost and performance needs. Always consult with a trusted mechanic or tuner to determine the appropriate hardware for your specific build.

**Final Recommendation:**

If your engine is running **significant power (e.g., 300 horsepower, forced induction, or aggressive camshafts)**, the Maxpeedingrods 4340 forged bolts are a **highly recommended upgrade** for safety and reliability. If your setup is more modest, weigh the cost against the potential benefits and consider alternatives. Proper installation and maintenance are critical to maximizing their lifespan.

Details:

Full physical. V PRODUCT TEST AND ISO 9001 CERTIFIED, Telephone number. Advertised Horsepower Rating:200HP/piece, Top acceleration: 9000rpm, package size 28CM 21CM 10CM.

Fast Shipping. 4x 4340 Forged Connecting Rods Bolts for Alfa Romeo 155 Q4 Fiat Abarth 131 16V. For Alfa Romeo 155 Q4 2.0 16v, Fiat Lancia Delta 16v Turbo, Abarth 131, HF Integrale1989-1991, Pin Type: Floating Piston.

Guaranteed Fitment Always the correct part.

specifications pistonrinro:

  • for models: Q4, Romeo
  • for makes: Alfa, Fiat
  • brand: Maxpeedingrods
  • mpn: 138rqc
  • part type: Rod Bolt
  • big end diameter: 53.91mm
  • big end width: 25.7mm
  • california prop 65 warning: California Prop 65 Warning
  • center to center length: 145mm
  • fit: For Fiat Lancia Delta 2.0 1.6v Turbo, For Fiat Abarth 131 2.0 8valve, For Alfa 155 Q4
  • material: Forged 4340 Aircraft Chrome Moly Quality Steel
  • note: No Instruction Included
  • notice: This Is Aftermarket Replcement Part
  • pin type: Bronzed Bushing Floating Pin
  • placement on vehicle: Front
  • quantity: 4 Pieces As Showing In Picture
  • small end diameter: 22mm
  • weight tolerance: Balanced To / 1 Gram In Set
  • country of origin: China

payments pistonrinro:

  • wallet: Apple-pay
  • other
  • credit card: Mastercard

offer pistonrinro:

  • sold: 0
  • quantity: 2
  • started: April 22, 2026
  • availability: In Stock
  • options: Ship-to-home
  • best offers: True

shipping pistonrinro:

  • transit: 2-5 Days
  • class: Standard
  • carrier: FedEx
  • cost: $0.00
  • service: FedEx Ground / FedEx Home Delivery
  • type: Fixed

general pistonrinro:

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

returns pistonrinro:

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

seller pistonrinro:

  • # reviews: 3468
  • city: Rowland height, California
  • rating: 99.7%
for models: q4, romeo, for makes: alfa, fiat, part type: rod bolt, big end diameter: 53.91mm, big end width: 25.7mm, california prop 65 warning: california prop 65 warning, center to center length: 145mm, fit: for fiat lancia delta 2.0 1.6v turbo, for fiat abarth 131 2.0 8valve, for alfa 155 q4, note: no instruction included, notice: this is aftermarket replcement part, pin type: bronzed bushing floating pin, placement on vehicle: front, quantity: 4 pieces as showing in picture, small end diameter: 22mm, weight tolerance: balanced to / 1 gram in set, country of origin: china,
category: auto parts > car truck parts accessories > engines engine parts > connecting rods parts, material: forged 4340 aircraft chrome moly quality steel, sku: 13290678150528721,
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