1. Pistons, Rings, Rods & Parts Engines Components For Sale
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  3. TRW CR1455-4

TRW CR1455-4 Connecting Rod Gm 32456-252 2.5L 151 265 301 4.9T

fits year: 1977–1986.

Cr1455-4 Trw 4 Cr1455 Reman Connecting Rod 1977-1986 Gm 2.5l 151 265 301 4.9t

( Brand: Trw ), ( Manufacturer Part Number: CR1455-4 ), ( Part Type: Rod ), ( Ipn: 32456 252 )

Review TRW Cr1455 Reman Connecting Rod Gm 2.5l 151 265 301 4.9t fits 1977–1986

The **TRW CR1455-4** is a high-performance, direct-fit connecting rod designed specifically for General Motors 2.5L inline-four engines produced between 1977 and 1986, including the iconic **4.9L Turbo (496 ci) models** such as those found in the Chevrolet Corvette (C3), Camaro Z28, and Firebird Trans Am. Engineered to meet the demands of both stock and modified applications, this rod is crafted from **forged 4340 steel**, a material renowned for its exceptional strength, durability, and resistance to fatigue critical attributes for high-revving, turbocharged, or high-performance setups. The **CR1455-4** replaces the stock rod, which may have been prone to failure under extreme stress, particularly in turbocharged or heavily modified engines where increased cylinder pressure and RPM can push components to their limits.

This connecting rod features a **precision-machined design** with a **full-floating piston pin**, ensuring minimal friction and optimal power transfer from the piston to the crankshaft. The **capless construction** eliminates the need for rod bolts and caps, reducing potential failure points while simplifying installation though it does require careful handling during assembly to prevent damage. The rod s **large, reinforced small end** is designed to handle the increased loads generated by turbocharging or forced induction, while the **large end** is machined to fit GM s standard crankshaft journals, ensuring a snug, interference-fit connection that resists slop and maintains rigidity under heavy loads. The **CR1455-4** is also compatible with a wide range of piston sizes, including **151, 265, 301, and 4.9T applications**, making it a versatile upgrade for both stock restorations and high-performance builds.

Beyond its structural integrity, the **TRW CR1455-4** is built to exacting tolerances, ensuring a seamless fit within the engine block and crankshaft. The rod s **polished surfaces** reduce internal friction, allowing for improved efficiency and longevity, while the **heat-treated material** ensures it can withstand the thermal cycling and mechanical stress of aggressive driving, turbocharging, or even nitrous oxide (NOS) applications. Whether you're rebuilding a classic Corvette for track use, restoring a Camaro Z28 to its peak performance, or upgrading a daily driver for better reliability under boost, this rod delivers the strength and precision needed to handle the demands of modern or modified operation. Backed by TRW s reputation for quality and performance, the **CR1455-4** is a proven component for those seeking to enhance the durability and power output of their GM 2.5L/4.9L engine without compromising on fitment or reliability.

### **Pros and Cons of Buying a TRW CR1455-4 (CR1455 Connecting Rod for 1977 1986 GM 2.5L Engines)**

#### **Pros:**

1. **Direct Fitment** The TRW CR1455-4 is specifically designed for GM 2.5L engines (including the 151, 265, 301, and 4.9T variants) from 1977 1986, ensuring compatibility without modification.

2. **High-Quality Material** TRW is a well-known manufacturer of aftermarket automotive parts, often using forged steel or high-strength alloys to improve durability compared to OEM rods.

3. **Potential Performance Benefits** Some aftermarket rods are reinforced or balanced better than stock parts, which can reduce vibration and improve engine longevity if installed properly.

4. **Cost-Effective Replacement** Purchasing a new or refurbished set can be cheaper than sourcing OEM rods, especially if the originals are damaged or hard to find.

5. **Warranty Coverage** Reputable sellers (like TRW or authorized dealers) may offer warranties, providing peace of mind against manufacturing defects.

6. **Easier Installation** Since these rods are designed for the application, they should fit without extensive machining, reducing labor costs compared to custom rods.

#### **Cons:**

1. **Potential Weaknesses Compared to OEM** Some aftermarket rods may not match the exact strength or machining tolerances of original GM rods, especially in high-stress applications (e.g., forced induction or aggressive tuning).

2. **Quality Variability** Not all aftermarket rods are created equal; cheaper alternatives may have inferior heat treatment or machining, leading to premature failure.

3. **Installation Risks** If not installed correctly (e.g., improper gap, incorrect torque, or misalignment), aftermarket rods can cause engine damage, including catastrophic failure.

4. **Compatibility Concerns** While TRW claims direct fitment, some users report minor clearance issues with pistons or crankshaft journals, requiring additional machining.

5. **No Guarantee of Longevity** Even high-quality aftermarket rods may not last as long as properly maintained OEM parts, especially in severe conditions (e.g., high RPM, extreme heat).

6. **Resale Value Impact** If you later sell the vehicle, some buyers may prefer OEM or high-end aftermarket parts, potentially affecting trade-in value.

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### **Conclusion**

The **TRW CR1455-4 connecting rod** is a **practical and cost-effective solution** for replacing worn or damaged rods in your 1977 1986 GM 2.5L engine, provided you source it from a reputable seller and ensure proper installation. It avoids the hassle of sourcing OEM parts and may offer slight performance or durability improvements over stock rods. However, it is **not a "drop-in" upgrade** it should be treated as a **direct replacement**, not an enhancement.

If your engine is **stock or lightly modified**, these rods will likely serve well. If you plan to **build significant horsepower** (e.g., turbocharging, forced induction, or aggressive tuning), consider **higher-end aftermarket rods** (e.g., JE, Scat, or ARP) that are specifically rated for high-stress applications. Always **verify the rod s specifications** (e.g., material, heat treatment, and balance) before purchasing and consult a **trusted mechanic** for installation.

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### **Recommendation:**

- **Buy from a trusted source** (e.g., RockAuto, Summit Racing, or a local auto parts store with a good return policy).

- **Check for authenticity** counterfeit or low-quality rods can cause serious engine damage.

- **Inspect the rods upon arrival** look for cracks, uneven machining, or signs of poor quality.

- **Have a mechanic verify fitment** before installation, especially if the engine has been modified.

- **Follow installation guidelines strictly**, including proper gap sizing, torque specs, and alignment.

- **Consider OEM rods** if you can find them at a reasonable price and your budget allows for a more "bulletproof" solution.

For most **stock or mildly modified** 2.5L GM engines, the **TRW CR1455-4 is a solid choice** just ensure you handle the purchase and installation with care.

Details:

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TRW part number CR1455-4. These items, although NEW, may contain shelf wear or imperfections due to the age of product.

part #: cr14554 price

  • $125.99

specifications pistonrinro:

  • for years: 1977-1986
  • brand: Trw
  • mpn: Cr1455-4
  • part type: Rod
  • ipn: 32456 252

payments pistonrinro:

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  • service: USPS Priority Mail
  • cost: $0.00
  • carrier: USPS
  • transit: 4-7 Days
  • type: Fixed
  • class: Expedited

offer pistonrinro:

  • started: March 19, 2026
  • quantity: 2
  • availability: In Stock
  • sold: 0
  • options: Ship-to-home

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

general pistonrinro:

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

seller pistonrinro:

  • rating: 99.7%
  • city: Houston, Texas
  • # reviews: 275313
for years: 1977-1986, part type: rod,
category: auto parts > car truck parts accessories > engines engine parts > connecting rods parts, sku: 12821147293077983,
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