1. Engine Mounts Deals
  2. sku: 23433516761310872
  3. GM 3980930/3964890

GM 3980930-3964890 Motor Mount Frame Brackets Lh Rh 3980930/3964890 Z28

fits model: Lt1, Camaro. year: 1970.

3964890 Gm 3980930/3964890 1970 Camaro Z28 Lt1 Motor Mount Frame Brackets Original 3980930 Lh Rh

( Brand: Gm ), ( Manufacturer Part Number: 3980930/3964890 ), ( Part Type: Bracket Motor Mount Frame ), ( Items Included: Bracket ), ( Vintage Part: Yes ), ( Country Of Origin: United States )

Review GM 3980930/3964890 Z28 Motor Mount Frame Brackets Original Lh Rh fits CAMARO LT1 1970

The **GM 3980930/3964890 Engine Mount Frame Brackets** are meticulously crafted aftermarket components designed specifically for the legendary **1970 Chevrolet Camaro Z/28**, ensuring a perfect fit for the iconic **LT1 small-block V8** engine bay. These high-quality brackets replace the original, often worn or deteriorated factory mounts, providing enhanced durability, improved alignment, and a more secure connection between the engine and the frame rails. Engineered from heavy-duty **stamped steel**, these brackets are built to withstand the rigors of high-performance driving, offering superior strength and resistance to fatigue critical for maintaining engine stability under heavy acceleration, hard braking, or aggressive cornering. The **3980930** part number corresponds to the **left-hand (LH) bracket**, while the **3964890** designates the **right-hand (RH) bracket**, ensuring a balanced and symmetrical installation that prevents uneven stress on the engine bay. Whether you're restoring a classic Camaro to its original glory or pushing it to the limits of modern performance, these brackets eliminate the need for jury-rigged solutions or compromised factory parts, delivering a clean, factory-inspired upgrade that preserves the vehicle s structural integrity while enhancing its driving dynamics. Ideal for both static restorations and high-performance builds, these brackets are a must-have for any enthusiast seeking reliability, precision, and the confidence of knowing their engine is securely supported.

**Pros and Cons of Buying GM 3980930/3964890 (1970 Camaro Z28 LT1 Motor Mount Frame Brackets)**

### **Pros:**

1. **Authentic Fitment** These brackets are designed specifically for the 1970 Chevrolet Camaro Z28 with the LT1 engine, ensuring a proper fit without modifications. They replace worn or damaged stock components, restoring structural integrity and alignment.

2. **Improved Durability** The brackets are likely made from high-strength steel or stamped metal, which is more robust than the original parts, reducing the risk of cracking or breaking over time. This is particularly useful for high-performance or heavily driven vehicles.

3. **Prevents Engine Movement** Properly installed motor mounts and frame brackets help keep the engine, transmission, and drivetrain aligned, reducing excessive vibration, rattles, and potential damage to surrounding components (e.g., exhaust, suspension, or drivetrain).

4. **Compatibility with Aftermarket Mods** If you plan to install aftermarket parts like a new exhaust, suspension, or performance engine, these brackets will help maintain proper spacing and alignment, preventing clearance issues.

5. **Easy Installation** As OEM replacement parts, they are designed to fit standard tools and procedures. Many mechanics and DIYers can install them without specialized equipment, though some welding or alignment adjustments may be needed.

6. **Cost-Effective Solution** Replacing worn brackets is often cheaper than repairing or replacing other damaged components (e.g., frame rails, exhaust manifolds, or suspension parts) caused by improper engine support.

7. **Maintains Factory Alignment** Unlike aftermarket brackets that may alter the vehicle s geometry, these parts replicate the original design, ensuring the Camaro s handling and drivability remain close to stock.

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### **Cons:**

1. **Potential for Wear or Damage** Even new brackets may show signs of wear (e.g., rust, minor dents) if they ve been stored improperly or are from a lower-quality source. Inspect them closely before purchasing.

2. **Installation Challenges** If the brackets are rusted or seized to the frame, removal may require cutting or grinding, which could damage the frame rails. Some vehicles may also need alignment after installation.

3. **Limited Customization** These are stock replacements, so they don t offer performance upgrades (e.g., stiffer mounts for track use) or aesthetic modifications (e.g., polished or custom finishes).

4. **Price Variability** Depending on the seller, these parts can range from reasonable to overpriced, especially if bought from specialty suppliers or eBay sellers with high fees. Always compare prices from reputable sources.

5. **Availability of Alternatives** Some aftermarket brands offer upgraded or reinforced brackets that may be more durable for aggressive driving. However, these alternatives might not fit as precisely as the OEM parts.

6. **Time-Consuming Project** If you re not experienced with engine bay work, installing these brackets may require several hours of labor, especially if you need to remove the engine or transmission for better access.

7. **Possible Counterfeit Parts** Buying from untrusted sellers increases the risk of receiving knockoffs that don t meet GM s specifications. Always verify the seller s reputation and part authenticity.

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### **Conclusion:**

The **GM 3980930/3964890 motor mount frame brackets** are a **practical and necessary replacement** for a 1970 Camaro Z28 with an LT1 engine, especially if the original brackets are cracked, bent, or failing. They provide **reliable support**, **prevent further damage**, and **maintain factory alignment**, making them a sound investment for both restoration and daily driving.

However, the **quality of the parts** and the **effort required for installation** can vary. If you re unsure about the condition of the brackets or the installation process, consider consulting a professional mechanic. For those comfortable with DIY work, these parts are a **wise upgrade** to avoid costly repairs down the line.

### **Recommendation:**

- **Buy from a trusted source** (e.g., RockAuto, Summit Racing, or a reputable parts dealer) to ensure authenticity and quality.

- **Inspect the brackets closely** for rust, bends, or defects before purchasing.

- **Budget for additional labor** if you re not experienced with engine bay work some vehicles may need alignment after installation.

- **Consider upgrading to aftermarket brackets** (e.g., Eibach, Holinger, or custom fabrications) if you plan to modify the vehicle aggressively (e.g., high-performance driving, track use, or heavy lifting).

- **Pair with other motor mount replacements** (e.g., the front and rear mounts) for complete support, as failing mounts often come in pairs.

**Final Verdict:** These brackets are a **solid, no-frills solution** for restoring proper engine support in a 1970 Camaro Z28. For most owners, they are a **worthwhile purchase** to prevent further damage and maintain drivability.

Details:

Quick Shipping. Used Oem GM 1970 Camaro big block engine mount brackets, the 3980930 bracket has had a corner sliced off it edges on both will need cleaned up as they were spot welded to frame.

part #: 39809303964890 price

  • $4595.00

specifications engimou:

  • for models: Lt1, Camaro
  • for years: 1970
  • brand: Gm
  • mpn: 3980930/3964890
  • part type: Bracket Motor Mount Frame
  • items included: Bracket
  • vintage part: Yes
  • country of origin: United States

returns engimou:

  • policy: Returns Accepted
  • paid by: Buyer
  • time: 14 Days

payments engimou:

  • wallet: Paypal
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  • credit card: Discover

general engimou:

  • condition: Used
  • Car Truck Parts Accessories > Engines Engine Parts > Engine Mounts

seller engimou:

  • # reviews: 1776
  • rating: 100.0%
  • city: Mesa, Arizona

shipping engimou:

  • type: Fixed
  • class: Standard
  • service: USPS Ground Advantage
  • carrier: USPS
  • cost: $11.00
  • transit: 5-11 Days

offer engimou:

  • options: Ship-to-home
  • sold: 0
  • started: May 22, 2026
  • quantity: 1
  • availability: In Stock
  • best offers: True
for models: lt1, camaro, for years: 1970, part type: bracket motor mount frame, items included: bracket, vintage part: yes, country of origin: united states,
category: auto parts > car truck parts accessories > engines engine parts > engine mounts, sku: 23433516761310872,
Gm 3980930-3964890 Is Similar To:
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1 offer $4595.00 USD
  • New. Offer #1 priced at $4595.00 + $75.00 shipping estimate = $4670.00* total. There are many interior knobs, switches, and detailing parts as well as trim, emblems and rare accessory lamp kits and under hood parts. Z28 LT1 Valve Cover Flag Emblems (2) 0.388 3946860.+$75.00 shipping

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