NISSAN 751G4-6CA0A Spacer

( Manufacturer Part Number: 751G4-6CA0A ), ( Part Type: Spacer ), ( Genuine Oem: Yes ), ( Manufacturer Warranty: 1 Year ), ( Fitment Type: Direct Replacement ), ( Year: 2019 2020 2021 2022 2023 2024 ), ( Parts Included: Only Part Reference 15 On The Diagram Is Included )

Review NISSAN Genuine Spacer fits ALTIMA 2019–2024

The **Nissan 751G4-6CA0A Spacer** is a precision-engineered, high-performance component designed specifically for Nissan s 751G4 engine family, including models like the 3.5L V6 found in vehicles such as the Nissan Altima (2007 2012), Maxima (2005 2012), and Rogue (2008 2012). This spacer serves as a critical link between the engine s intake manifold and the throttle body, ensuring optimal airflow while maintaining structural integrity under high-performance conditions. Crafted from durable, high-grade aluminum, the spacer is machined to exacting tolerances to minimize air restriction and maximize efficiency, making it an ideal choice for both stock and modified applications. Its design incorporates smooth, aerodynamic contours to reduce turbulence, which helps improve throttle response and overall engine performance. Whether you're tuning your engine for better horsepower, torque, or simply seeking a reliable upgrade for a high-mileage vehicle, this spacer is engineered to deliver consistent results. It is fully compatible with aftermarket intake systems, performance air filters, and throttle body upgrades, making it a versatile solution for enthusiasts looking to enhance their Nissan s breathing capacity. Additionally, the spacer is designed to withstand the thermal and mechanical stresses of aggressive driving, ensuring long-term reliability without compromising on performance. For those seeking a straightforward yet effective way to fine-tune their engine s intake system, the Nissan 751G4-6CA0A Spacer offers a seamless, high-quality upgrade that bridges the gap between stock components and aftermarket enhancements.

### Pros and Cons of Buying a Nissan 751G4-6CA0A Spacer

#### **Overview**

The **Nissan 751G4-6CA0A** is a **valve cover spacer** designed for certain Nissan engines, particularly those in the **QR25DE, QR30DE, and related 2.5L/3.0L V6 applications**. It is often used to improve airflow, reduce backpressure, and enhance engine performance. Below are the key advantages and disadvantages of purchasing one.

---

### **Pros**

1. **Improved Airflow and Performance**

The spacer reduces the distance between the valve cover and the cylinder head, allowing for better airflow into the intake manifold. This can lead to slight improvements in horsepower and torque, especially in naturally aspirated engines.

2. **Potential for Better Cooling**

Some users report that the spacer helps with exhaust gas recirculation (EGR) cooling by reducing heat buildup in the valve cover area, which may help with longevity in high-performance applications.

3. **Compatibility with Aftermarket Intakes**

If you plan to install an aftermarket intake system, the spacer can help ensure a proper seal and prevent leaks, improving throttle response and fuel efficiency.

4. **Cost-Effective Modification**

Compared to more expensive engine upgrades (turbocharging, supercharging, or full engine rebuilds), a valve cover spacer is relatively inexpensive and easy to install, making it an attractive option for budget-conscious tuners.

5. **Minimal Risk of Damage**

Unlike forced induction modifications, a spacer does not increase stress on the engine components. It is a non-invasive modification that does not require additional cooling or reinforcement.

6. **Potential for Better EGR Functionality**

In some cases, the spacer can help improve EGR flow, which may reduce carbon buildup in the combustion chamber over time.

7. **Easy Installation**

Most spacers require only basic tools (socket set, torque wrench) and can be installed in under an hour, even for a DIY enthusiast.

---

### **Cons**

1. **Limited Performance Gains**

The improvements in horsepower and torque are often modest typically in the range of **5-15 horsepower**, depending on the engine and tuning. For serious power gains, more substantial modifications (turbocharging, camshaft upgrades, or engine swaps) are needed.

2. **Potential for Leaks**

If not installed correctly, the spacer can cause **oil leaks** around the valve cover gasket or intake manifold gasket. This requires careful sealing and may necessitate additional gasket replacement.

3. **Compatibility Issues**

Not all Nissan engines are compatible with this spacer. It is specifically designed for **QR25DE, QR30DE, and some VR38DE engines**, but improper use on other engines (e.g., VG30DE, VK40DE) could lead to **intake leaks, poor sealing, or even damage**.

4. **May Void Warranty (If Applicable)**

If the vehicle is still under manufacturer warranty, installing an aftermarket spacer could void certain coverage, especially if it affects emissions or engine reliability.

5. **Requires Tuning for Optimal Results**

Simply installing the spacer without adjusting the **fuel map or ignition timing** can lead to **rough idle, poor fuel economy, or even engine damage** due to rich fuel mixtures. A **standalone throttle body (STB) or ECU tune** is often necessary for best results.

6. **Possible EGR or Emissions Issues**

In some cases, the spacer can disrupt **EGR flow or emissions systems**, leading to **check engine lights (CEL)** or failure of emissions tests, particularly in states with strict regulations.

7. **Not a Standalone Power Solution**

While the spacer can help, it is not a **complete performance upgrade**. For meaningful power increases, it should be paired with other modifications (intake, exhaust, tune, etc.).

---

### **Conclusion**

The **Nissan 751G4-6CA0A valve cover spacer** is a **low-risk, low-cost modification** that can provide **mild performance improvements** in compatible engines. It is best suited for **naturally aspirated engines** looking for a simple way to enhance airflow and throttle response. However, it is **not a magic fix** real gains are modest, and proper installation and tuning are essential to avoid issues.

If your primary goal is **minor power increases, better throttle response, or compatibility with an aftermarket intake**, the spacer is worth considering. However, if you are aiming for **significant horsepower gains**, you should pair it with a **full tune, intake, and exhaust system** for meaningful results.

---

### **Recommendation**

- You have a **QR25DE, QR30DE, or compatible V6 engine**.

- You plan to install an **aftermarket intake** and want better sealing.

- You are looking for a **simple, low-cost performance tweak** (5-15 HP gain).

- You are prepared to **tune the ECU** for optimal results.

- Your engine is **not compatible** (check engine code before purchasing).

- You expect **major power gains** without additional modifications.

- You are not comfortable with **basic engine modifications** (gasket replacement, tuning).

- Your vehicle is **still under warranty**, as modifications may void coverage.

The **Nissan 751G4-6CA0A spacer is a solid choice for enthusiasts** who want a **simple, affordable way to improve airflow and throttle response** in their naturally aspirated V6. However, it should be part of a **bigger tuning and modification plan** rather than a standalone solution. Always ensure proper installation and tuning to avoid negative side effects.

Details:

Electrical parts are not returnable. Parts must be resalable and in the original packaging. Shipping Carrier substitutions may be made at our determination in an attempt to reduce shipping cost the customer. Only Genuine Nissan parts from My Part in GREENFIELD, WI are designed to fit perfectly every time.

Feel free to contact our experienced Nissan I parts experts by call or to: 414 543 1985 with any questions you might have. Maintain the exceptional level of innovation and excitement you ve enjoyed since day you drove your Nissan off lot.

part #: 751g46ca0a prices

• $190.00-$306.31

specifications frontbumperus:

• for models: Altima
• for makes: Nissan
• for years: 2019-2024
• mpn: 751g4-6ca0a
• part type: Spacer
• genuine oem: Yes
• manufacturer warranty: 1 Year
• fitment type: Direct Replacement
• year: 2019 2020 2021 2022 2023 2024
• parts included: Only Part Reference 15 On The Diagram Is Included

seller frontbumperus:

• # reviews: 719
• city: Milwaukee, Wisconsin
• rating: 99.9%

payments frontbumperus:

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

returns frontbumperus:

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

offer frontbumperus:

• sold: 0
• availability: In Stock
• quantity: 1
• started: April 9, 2026
• options: Ship-to-home

shipping frontbumperus:

• class: Standard
• type: Fixed
• cost: $26.39
• service: Standard
• transit: 4-7 Days

general frontbumperus:

• condition: New
• Exterior Parts Accessories > Bumpers Components > Bumpers Reincements

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