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  3. MANLEY 14559R6-1

MANLEY 14559R6-1 Engine Connecting Rod Ls 807298086316 6.125

14559r6-1 Manley Engine Connecting Rod - Rod-sbc Ls 6.125

( Brand: Manley ), ( Manufacturer Part Number: 14559R6-1 ), ( Part Type: Engine Rod ), ( Warranty: 1 Year ), ( Product Market: Domestic ), ( Average Gram Weight: 705 Gr ), ( Big End Bore: 2.225 In ), ( Center To Center Length: 6.125 In ), ( Journal Size: Stock ), ( Length: .025 Longer ), ( Pin End Bore: 0.9281 In ), ( Wrist Pin Diameter: 0.927 In ), ( Connecting Rod Series: Pro Series I-beam ), ( Connecting Rod Sub-series: Standard Weight ), ( Product Type: Engine Connecting Rod ), ( Rod Bolt Material: Arp 625 ), ( Connecting Rod Type: I-beam ), ( Pin End Width: 1.000 In ), ( Connecting Rod Material: 4340 ), ( Industry: Automotive ), ( Out Of Stock Message: Call For Availability ), ( Prop 65 Yes/no: Yes ), ( Prop 65: C ), ( R Or Cr : Cr ), ( Prop 65 Short Label: Prop 65 Warning Label.jpg ), ( Engine Type: Ice ), ( Make: Chevrolet ), ( Engine: Ls ), ( Country Of Origin: United States ), ( UPC: 807298086316 )

Review MANLEY Engine Connecting Rod sbc Ls 6.125 fits 125

The **Manley 14559R6-1 Engine Connecting Rod (SBC/LS 6.125")** is a meticulously crafted, high-performance aftermarket replacement designed to elevate the durability, reliability, and power output of GM s iconic Small Block Chevrolet (SBC) and LS engine families, particularly those featuring a 6.125-inch crankshaft journal. Engineered with precision and built to exacting standards, this rod is a superior alternative to OEM components, offering enhanced strength, reduced weight, and improved resistance to fatigue critical attributes for high-revving, high-torque applications such as forced induction builds, drag racing, or daily drivers pushing beyond stock limits.

Constructed from **4340 chromoly steel**, a material renowned for its exceptional strength-to-weight ratio, this connecting rod delivers a robust yet lightweight solution that minimizes reciprocating mass, allowing the engine to spin more freely and efficiently. The rod is **fully machined and polished** to ensure smooth operation, with a **forged steel cap** secured by **Grade 8 or ARP bolts** (depending on the application), providing unmatched clamping force and preventing catastrophic failure under extreme stress. The **oil hole alignment** is optimized for proper lubrication, reducing friction and extending component life, while the **rod bolt holes** are precision-drilled to match the rod s geometry, ensuring a perfect fit with the crankshaft and cap.

One of the standout features of the Manley 14559R6-1 is its **customized length and offset**, tailored specifically for the 6.125-inch crankshaft journal found in certain SBC and LS engines. This precise engineering ensures proper piston-to-wall clearance and optimal piston pin alignment, reducing side loading and wear on the piston and cylinder walls. The rod s **smooth, polished surfaces** further minimize friction, contributing to improved engine efficiency and longevity, especially under high-stress conditions where heat and mechanical strain are elevated.

For enthusiasts and professional builders seeking a **drop-in replacement** that exceeds OEM specifications, the Manley 14559R6-1 is an ideal choice. It is **fully compatible** with a wide range of SBC and LS engine configurations, including but not limited to the LS1, LS2, LS3, LS6, and certain high-performance variants, making it a versatile upgrade for both street and track applications. Whether installed in a naturally aspirated engine pushing 600 horsepower or a turbocharged or supercharged setup exceeding 1,000 horsepower, this rod delivers the structural integrity and performance required to handle the most demanding workloads.

Manley s reputation for quality is backed by rigorous testing and manufacturing processes, ensuring that each rod meets or exceeds industry standards for fatigue life, strength, and reliability. The **heat-treated and stress-relieved** construction guarantees that the rod will maintain its structural integrity even under prolonged high-RPM operation or extreme torque loads. Additionally, the **pre-drilled and tapped rod cap** allows for easy installation of ARP or other high-performance bolts, further enhancing the rod s ability to withstand the forces generated in aggressive engine builds.

In summary, the **Manley 14559R6-1 Engine Connecting Rod** is a premium, performance-focused replacement designed to transform the performance characteristics of SBC and LS engines with a 6.125-inch crankshaft journal. With its **4340 chromoly construction, precision machining, optimized geometry, and compatibility with high-performance bolt patterns**, this rod is an essential component for builders aiming to maximize power, durability, and efficiency. Whether used in a street machine, a race engine, or a high-revving daily driver, the Manley 14559R6-1 sets a new standard for connecting rod performance, offering a blend of strength, reliability, and precision engineering that simply cannot be matched by stock components.

### **Pros and Cons of buying a Manley 14559R6-1 Engine Connecting Rod (SBC LS 6.125)**

#### **Pros:**

1. **High-Quality Material and Construction** Manley rods are known for using forged steel, which provides superior strength, durability, and resistance to fatigue compared to cast rods. This makes them ideal for high-performance applications, including forced induction builds.

2. **Precision Machining** These rods are designed to tight tolerances, ensuring proper fitment with the crankshaft, pistons, and main bearings. This reduces the risk of premature wear or failure, especially under heavy loads.

3. **Compatibility with LS 6.125 Engines** The rod is specifically engineered for the **SBC (Small Block Chevrolet) LS 6.125** platform, meaning it will fit stock crankshafts and main bearing caps without modification. This makes installation straightforward for most builds.

4. **Aftermarket Support and Availability** Manley is a well-established brand with a strong reputation in the performance market. Parts are widely available through reputable suppliers, and technical support is generally reliable.

5. **Potential for Increased Reliability** If your engine is running on stock rods (especially older cast rods), upgrading to Manley forged rods can significantly improve reliability, especially under high RPM or boosted conditions.

6. **Compatibility with Upgrades** These rods work well with aftermarket pistons, crankshafts, and other performance components, making them a versatile choice for builds ranging from mild street applications to high-performance setups.

7. **Warranty Coverage** Manley typically offers warranties on their rods, providing some peace of mind against manufacturing defects.

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#### **Cons:**

1. **Higher Cost Compared to Stock or Budget Aftermarket Rods** Manley rods are premium components, meaning they cost significantly more than OEM (stock) rods or cheaper aftermarket alternatives. This can be a barrier for budget-conscious builders.

2. **Installation Complexity** While the rod itself is designed for easy fitment, installing it requires proper alignment, torque specifications, and potentially additional machining (e.g., crankshaft journal polishing). Improper installation can lead to failure, so it demands attention to detail.

3. **Potential for Overkill on Mild Builds** If you re running a stock or lightly modified engine (e.g., naturally aspirated with stock components), the extra strength of Manley rods may not be necessary. In such cases, cheaper rods or even stock rods could suffice.

4. **Weight Consideration** Forged rods are heavier than cast rods, which can slightly reduce engine responsiveness, especially in high-revving applications. However, the difference is usually negligible unless you re building a race engine.

5. **Compatibility with Non-Stock Crankshafts** While the rod fits standard LS 6.125 crankshafts, if you re using a custom or aftermarket crank (e.g., with different journal sizes), you may need to verify fitment or consider machining.

6. **Learning Curve for DIY Installers** If you re not experienced with engine assembly, installing these rods may require professional help, adding to labor costs.

7. **Potential for Misuse in Improper Builds** If the rest of the engine (e.g., pistons, bearings, oil system) is not adequately upgraded for the rod s strength, it could lead to premature failure. For example, using stock bearings with high-performance rods is not recommended.

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### **Conclusion:**

The **Manley 14559R6-1 connecting rod** is an excellent choice for **LS 6.125 engines** undergoing performance upgrades, particularly those involving forced induction, high RPM, or aggressive tuning. Its forged construction, precision machining, and compatibility with the platform make it a reliable and durable option. However, the higher cost and the need for proper installation and supporting upgrades (e.g., pistons, bearings, oil system) must be considered.

For **stock or mildly modified engines**, the investment may not be justified, and cheaper rods or stock components could be sufficient. For **serious performance builds**, the Manley rod is a strong recommendation due to its proven track record and ability to handle extreme stresses.

### **Recommendation:**

- **Buy if:** You re building a **high-performance LS 6.125 engine** (turbocharged, supercharged, or high-RPM naturally aspirated) and want maximum reliability. Ensure the rest of the engine (pistons, bearings, oil pump, etc.) is upgraded accordingly.

- **Skip if:** You re on a tight budget, running a stock or lightly modified engine, or prefer a simpler (and cheaper) solution. In such cases, consider **aftermarket cast rods (e.g., JE, ARP)** or stock rods with proper maintenance.

- **Consider alternatives if:** You need a lighter rod (e.g., for racing) or a more budget-friendly option (e.g., **ARP 9000 rods** or **JE rods** for similar performance at a lower cost).

Ultimately, the Manley rod is a **top-tier choice for performance builds**, but its value depends on your specific project requirements.

Details:

Part #: 14559R6-1. Today, Manley manufactures crankshafts, connecting rods, pistons, push rods, rocker arms, valve springs, lash caps, guide plates, and many other OEM high performance components. Throughout the 1970s, legendary racers such as dont Galoots, Bill Jenkins, Joe Mendel, and Jungle Jim Lieberman equipped their vehicles with Manley components. ABOUT THE BRAND: Manley performance products have been tearing up streets and tracks worldwide since 1966.

Manley Engine Connecting Rod - Rod-SBC LS 6.125. Need advice on which exhaust system to purchase. Unleash your street/strip machines true power potential with time-tested components from Manley. Having trouble deciding on whether to get a folding or roll-up tonne cover.

part #: 14559r61 price

  • $379.91

specifications pistonrinro:

  • brand: Manley
  • mpn: 14559r6-1
  • part type: Engine Rod
  • warranty: 1 Year
  • product market: Domestic
  • average gram weight: 705 Gr
  • big end bore: 2.225 In
  • center to center length: 6.125 In
  • journal size: Stock
  • length: .025 Longer
  • pin end bore: 0.9281 In
  • wrist pin diameter: 0.927 In
  • connecting rod series: Pro Series I-beam
  • connecting rod sub-series: Standard Weight
  • product type: Engine Connecting Rod
  • rod bolt material: Arp 625
  • connecting rod type: I-beam
  • pin end width: 1.000 In
  • connecting rod material: 4340
  • industry: Automotive
  • out of stock message: Call For Availability
  • prop 65 yes/no: Yes
  • prop 65: C
  • r or cr : Cr
  • prop 65 short label: Prop 65 Warning Label.jpg
  • engine type: Ice
  • make: Chevrolet
  • engine: Ls
  • country of origin: United States
  • upc: 807298086316

offer pistonrinro:

  • availability: In Stock
  • sold: 0
  • quantity: 2
  • options: Ship-to-home
  • started: May 6, 2026

shipping pistonrinro:

  • transit: 3-7 Days
  • class: Standard
  • service: FedEx Ground / FedEx Home Delivery, UPS Ground
  • type: Fixed
  • carrier: FedEx, UPS
  • cost: $0.00

payments pistonrinro:

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

returns pistonrinro:

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

general pistonrinro:

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

seller pistonrinro:

  • # reviews: 3414
  • rating: 97.0%
  • city: Arlington, Texas
part type: engine rod, warranty: 1 year, product market: domestic, average gram weight: 705 gr, big end bore: 2.225 in, center to center length: 6.125 in, journal size: stock, length: .025 longer, pin end bore: 0.9281 in, wrist pin diameter: 0.927 in, connecting rod series: pro series i-beam, connecting rod sub-series: standard weight, product type: engine connecting rod, rod bolt material: arp 625, connecting rod type: i-beam, pin end width: 1.000 in, connecting rod material: 4340, industry: automotive, out of stock message: call for availability, prop 65 yes/no: yes, prop 65: c, r or cr: cr, prop 65 short label: prop 65 warning label.jpg, engine type: ice, engine: ls, country of origin: united states,
manufacturer: chevrolet, category: auto parts > car truck parts accessories > engines engine parts > connecting rods parts, sku: 13466776191948721,
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