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  3. GM 357055

GM 357055 Nos Exhaust Heat Valve Actuator Mount Bracket General

fits model: Corvette. year: 1975–1978.

357055 General Motors 1975-1978 Corvette Gm# Nos Exhaust Heat Valve And Actuator Mount Bracket

( Brand: Gm ), ( Manufacturer Part Number: 357055 ), ( Part Type: Heat Valve Actuator Bracket Exhaust Mount Motor ), ( Vintage Part: Yes ), ( Universal Fitment: Direct Replacement ), ( Manufacturer Warranty: No ), ( California Prop 65 Warning: Warning, Servicing And Maintaining A Passenger Vehicle Or Off-highway Motor Vehicle Can Expose You To Chemicals Including Engine Exhaust, Carbon Monoxide, Phthalates, And Lead, Which Are Known To The State Of California To Cause Cancer And Birth Defects Or Other Reproductive Harm. To Minimize Exposure, Avoid Breathing Exhaust, Do Not Idle The Engine Except As Necessary, Service Your Vehicle In A Well-ventilated Area And Wear Gloves Or Wash Your Hands Frequently When Servicing Your Vehicle. For More Information Go To Www.p65warnings.ca.gov/passenger-vehicle. ), ( Color: Black ), ( Placement On Vehicle: Front, Right ), ( Country Of Origin: Canada ), ( Item: Tracy Corvette 37786 )

Review GM General Motors Gm# Nos Exhaust Heat Valve And Actuator Mount Bracket fits CORVETTE 1975–1978

The **1975 1978 Chevrolet Corvette (GM NO. 357055) Exhaust Heat Valve Actuator Mount Bracket** is a critical yet often overlooked component that plays a pivotal role in the proper function and longevity of your classic L82 or L48 small-block V8 engine. This precision-machined bracket serves as the structural anchor for the exhaust heat valve actuator a small but essential device designed to regulate the flow of exhaust gases through the intake manifold during warm-up, ensuring optimal engine performance and preventing cold-start issues. Crafted from high-quality steel and engineered to match the exact specifications of the original GM design, this bracket is built to withstand the rigors of high-temperature environments while maintaining a secure fit within the engine bay. Its unique shape and mounting points align seamlessly with the intake manifold and exhaust heat valve actuator, providing the necessary stability to prevent rattling or misalignment, which can lead to premature wear or failure of the actuator itself. For enthusiasts restoring or maintaining their Corvette, this bracket is a must-have replacement part, especially if the original has deteriorated due to corrosion, wear, or improper installation. Whether you're tackling a full engine rebuild, addressing a specific performance issue, or simply ensuring the reliability of your classic muscle car, this bracket guarantees a tight, factory-accurate fit that restores the intended functionality of the exhaust heat valve system. Its straightforward yet essential role underscores why it s a small but significant piece in preserving the integrity of your Corvette s drivetrain.

### Pros and Cons of Buying a 1975 1978 Chevrolet Corvette GM NOS Exhaust Heat Valve Actuator Mount Bracket

#### **Pros**

1. **Authentic Restoration Potential** This part is a genuine no-service-replacement (NOS) component, meaning it was never installed in a production vehicle and has not been used. For enthusiasts restoring a classic Corvette, NOS parts are highly desirable as they preserve the originality and historical integrity of the build.

2. **Improved Reliability and Performance** The exhaust heat valve actuator mount bracket is a functional part of the exhaust heat valve system, which helps regulate exhaust gas flow and engine warm-up. A new, NOS part ensures proper fitment, reducing the risk of leaks, misalignment, or premature failure compared to aftermarket or used parts.

3. **Avoids Common Wear Issues** Over time, the bracket and actuator can corrode or wear out, leading to rattles, improper valve operation, or even failure. A NOS part eliminates these concerns, providing a fresh, unmodified component that should last the life of the vehicle if properly maintained.

4. **Easier Installation and Compatibility** NOS parts are designed to fit seamlessly into the original vehicle architecture. Since they come directly from General Motors inventory, they avoid the potential sizing or fitment issues that can arise with aftermarket replacements, which may require modifications or additional labor.

5. **Investment in Classic Car Value** For collectors and restorers, NOS parts are a premium commodity. Owning a NOS exhaust heat valve actuator mount bracket can enhance the resale value of a restored Corvette, as buyers often prioritize original or NOS components in high-end classic cars.

6. **Reduced Risk of Counterfeit Parts** NOS parts are sourced from original manufacturer stock, reducing the likelihood of purchasing a fake or low-quality replica. This is particularly important in the classic car restoration market, where counterfeit parts can degrade performance and authenticity.

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#### **Cons**

1. **High Cost** NOS parts are significantly more expensive than aftermarket or used alternatives. The price reflects their scarcity, original condition, and the effort required to source them from archived inventory. For budget-conscious restorers, this can be a substantial financial burden.

2. **Limited Availability** NOS parts are not mass-produced for modern vehicles, and their availability depends on the condition of GM s archived stock. Once depleted, replacements may require sourcing from collectors, which can drive prices even higher or make the part impossible to find.

3. **Potential for Overkill** If the vehicle is not being restored to concours-level perfection or sold as a collector s item, the expense of a NOS part may not be justified. For a project car or a daily driver, aftermarket or used parts could suffice without compromising performance or reliability.

4. **Storage and Handling Challenges** NOS parts are often stored in climate-controlled environments to prevent degradation. Shipping or handling them improperly can risk damage, adding to the cost and complexity of acquisition.

5. **Time-Consuming Procurement** Finding and purchasing a NOS part may require extensive research, contacting specialty suppliers, or bidding in auctions. This process can delay restoration timelines, especially if the part is in high demand.

6. **Mixed Benefits for Performance** While the exhaust heat valve system is functional, its primary role is to improve cold-weather operation by directing exhaust heat to the engine bay. For modern driving conditions, the impact on performance may be minimal compared to other upgrades (e.g., exhaust headers, fuel system modifications). The cost-benefit ratio may not align with other restoration priorities.

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### **Conclusion**

The GM NOS exhaust heat valve actuator mount bracket for the 1975 1978 Corvette is a high-quality, authentic component that offers significant advantages for restorers and collectors. Its primary benefits lie in reliability, historical accuracy, and the potential to enhance the vehicle s value. However, the high cost, limited availability, and potential overkill for non-concours projects make it a less practical choice for casual enthusiasts or those on a tight budget.

For **restorers aiming for perfection, collectors, or those prioritizing originality**, the investment is justified. For **project cars, daily drivers, or budget-focused builds**, aftermarket or used alternatives may provide comparable performance at a fraction of the cost.

### **Recommendation**

- **Buy the NOS part if:**

- You are restoring a Corvette to concours or show-quality standards.

- You are a collector prioritizing original or NOS components for resale value.

- You have verified that the part is critical to your restoration goals and budget allows for the expense.

- **Consider alternatives if:**

- Your project is functional rather than cosmetic, and you are working within a limited budget.

- You can source a high-quality aftermarket or used part that meets your needs without compromising fitment or performance.

- The exhaust heat valve system is not a top priority compared to other restoration tasks (e.g., engine rebuild, suspension, or bodywork).

Ultimately, weigh the part s role in your Corvette s overall goals against its cost and availability to determine whether it is the right choice for your project.

Details:

Corvette Series Keep Your GM Car All. This is for one NEW 1975-1978 CORVETTE GM# 357055 NOS Exhaust Heat Valve and Actuator Mount Bracket. NOS, New Old Stock, GM Discontinued, No Longer Available. Smaller items are shipped Standard USA Postal Service or USPS Priority Mail.

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part #: 357055 prices

  • $100.00-$149.00

specifications emissyste:

  • for models: Corvette
  • for years: 1975-1978
  • brand: Gm
  • mpn: 357055
  • part type: Heat Valve Actuator Bracket Exhaust Mount Motor
  • vintage part: Yes
  • universal fitment: Direct Replacement
  • manufacturer warranty: No
  • california prop 65 warning: Warning, Servicing And Maintaining A Passenger Vehicle Or Off-highway Motor Vehicle Can Expose You To Chemicals Including Engine Exhaust, Carbon Monoxide, Phthalates, And Lead, Which Are Known To The State Of California To Cause Cancer And Birth Defects Or Other Reproductive Harm. To Minimize Exposure, Avoid Breathing Exhaust, Do Not Idle The Engine Except As Necessary, Service Your Vehicle In A Well-ventilated Area And Wear Gloves Or Wash Your Hands Frequently When Servicing Your Vehicle. For More Information Go To Www.p65warnings.ca.gov/passenger-vehicle.
  • color: Black
  • placement on vehicle: Front, Right
  • country of origin: Canada
  • item: Tracy Corvette 37786

general emissyste:

  • condition: New other see details
  • Car Truck Parts Accessories > Exhaust Emission Systems > Other Exhaust Emission Parts

payments emissyste:

  • other
  • credit card: Discover
  • wallet: Google-pay

shipping emissyste:

  • cost: $13.00
  • class: Expedited
  • transit: 3-8 Days
  • type: Fixed
  • carrier: USPS
  • service: USPS Priority Mail Small Flat Rate Box

seller emissyste:

  • # reviews: 21918
  • rating: 99.4%
  • city: Roseville, Michigan

returns emissyste:

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

offer emissyste:

  • quantity: 1
  • availability: In Stock
  • options: Ship-to-home
  • sold: 0
  • started: March 17, 2026
for models: corvette, for years: 1975-1978, part type: heat valve actuator bracket exhaust mount motor, vintage part: yes, universal fitment: direct replacement, manufacturer warranty: no, california prop 65 warning: warning, servicing and maintaining a passenger vehicle or off-highway motor vehicle can expose you to chemicals including engine exhaust, carbon monoxide, phthalates, and lead, which are known to the state of california to cause cancer and birth defects or other reproductive harm. to minimize exposure, avoid breathing exhaust, do not idle the engine except as necessary, service your vehicle in a well-ventilated area and wear gloves or wash your hands frequently when servicing your vehicle. for more information go to www.p65warnings.ca.gov/passenger-vehicle., placement on vehicle: front, right, country of origin: canada, item: tracy corvette 37786,
category: auto parts > car truck parts accessories > exhaust emission systems > exhaust emission parts, color: black, sku: 20795053505527793,
Gm 357055 Is Similar To:
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3 offers $100.00–$149.00 USD
  • New other (see details). Offer #1 priced at $100.00 + $6.58 shipping estimate = $106.58* total. Here are the key details about this part. GM part # is an exhaust heat valve and actuator mount bracket for a 1975 1978 C3 Corvette.+$6.58 shipping
  • New. Offer #2 priced at $127.00 + $8.00 shipping estimate = $135.00* total. Location D129 #55 The product is a 1975-1978 Corvette GM# NOS Exhaust Heat Valve and Actuator Mount Bracket.+$8.00 shipping
  • New other (see details). Offer #3 priced at $149.00 + $13.00 shipping estimate = $162.00* total. Corvette Series "Keep Your GM Car All GM!" This is for one NEW 1975-1978 CORVETTE GM# NOS Exhaust Heat Valve and Actuator Mount Bracket.+$13.00 shipping

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