MOPAR GPT2NND0336AA Smog Heads Duster Need Up 2.02 Duster.

( Manufacturer Part Number: GPT2NND0336AA ), ( Type: Cylinder Head Assembly ), ( Manufacturer Warranty: 1 Year ), ( Oe/oem Part Number: 2531894 ), ( Material: Cast Iron ), ( Vintage Part: Yes ), ( California Prop 65 Warning: This Product Can Expose You To Chemicals Including Chromium, Which Are Known To The State Of California To Cause Birth Defects Or Other Reproductive Harm. )

Review MOPAR Pre smog 2.02 Heads From My Duster. Need To Be Cleaned Up fits 340 1970

The **Mopar GPT2NND0336AA 1970 Pre-Smog 2.02L (340 CID) Heads-Up Duster** is a meticulously crafted, high-performance cylinder head designed exclusively for the iconic 340 cubic inch small-block Ford V8 engines produced before the 1970 smog-era regulations. Engineered to deliver exceptional breathing and reliability, this head is a sought-after component for enthusiasts seeking to restore or enhance the power output of their classic muscle cars, trucks, or marine applications. The casting features a robust, heavy-duty design with precise valve angle and port geometry, optimized to maximize airflow while maintaining structural integrity under high-performance conditions. The **heads-up duster** configuration ensures a clean, unobstructed port profile, allowing for improved exhaust and intake flow without the need for extensive porting or machining, making it an ideal choice for both stock and mild performance builds. These heads are forged from high-quality iron, offering durability and resistance to warping, which is critical for maintaining compression and power output over time. The **pre-smog** designation signifies that they are designed to accommodate the original, unrestricted valve sizes and lift specifications of the 1970-era engines, avoiding the compromises introduced by later emissions regulations. Whether paired with a stock or upgraded camshaft, this head delivers a balanced blend of power and reliability, making it a perfect fit for applications ranging from daily drivers to high-revving street machines. For those looking to preserve the authenticity of their classic Ford V8 while unlocking its full potential, the **GPT2NND0336AA** stands as a premium, ready-to-install solution that bridges the gap between stock performance and serious horsepower.

### **Pros and Cons of Buying a 1970 Mopar GPT 2.0L (340 CID) "Heads & Duster" Pre-Smog Engine**

#### **Pros**

1. **Classic Mopar Performance** The 340 CID "Heads & Duster" engine is a legendary powerplant from the golden era of American muscle. It was designed for high-performance applications, offering strong torque and acceleration, making it ideal for drag racing, street cruising, or restoration projects.

2. **Proven Reliability (When Properly Maintained)** Unlike some modern engines, the 340 CID was built with durable materials and straightforward design principles. With proper upkeep regular oil changes, valve adjustments, and head gasket maintenance it can last well beyond 100,000 miles.

3. **Easy to Work On** Mopar engines from this era are known for their simplicity compared to modern fuel-injected or turbocharged designs. Swapping parts, rebuilding, or modifying is relatively straightforward, making repairs and upgrades accessible for DIY enthusiasts.

4. **Strong Aftermarket Support** There is an extensive aftermarket for Mopar parts, including performance upgrades (e.g., headers, carburetors, camshafts, and fuel pumps). Rebuilding kits, blueprints, and tuning resources are widely available.

5. **Classic Driving Experience** The deep, throaty exhaust note, smooth power delivery, and manual transmission options (if equipped) provide a satisfying driving experience that modern cars often lack.

6. **Potential for High Horsepower** With the right modifications (big-block heads, high-performance camshafts, forced induction, or nitrous), this engine can produce **500 horsepower** in a stock-block configuration, making it a favorite for street and strip applications.

7. **Lower Cost of Ownership (Compared to Modern Engines)** While parts can be expensive upfront, the long-term cost of maintenance is often lower than that of modern turbocharged or direct-injection engines, which are prone to more complex (and costly) failures.

8. **Restoration Potential** If the engine is in rough shape, a full rebuild or swap into a newer chassis can turn it into a highly desirable project car, especially in the muscle car scene.

9. **Community & Show Potential** The 340 CID is a sought-after engine for concours and show cars. A well-restored example can command high value at car shows and auctions.

10. **No Modern Electronics to Fail** Unlike modern engines with complex ECUs, sensors, and software glitches, the 340 CID relies on mechanical and carbureted systems, reducing the risk of electronic malfunctions.

---

#### **Cons**

- **Head gaskets** A common failure point, especially if the engine overheats or runs low on coolant.

- **Valvetrain wear** The pushrod and rocker arm setup requires regular valve adjustments (every 5,000 10,000 miles).

- **Rod bearings & main bearings** Older engines often suffer from bearing wear if not properly lubricated.

- **Fuel system issues** Carburetors (if equipped) require tuning and cleaning; modern fuel systems may not be compatible without modifications.

2. **Fuel Economy is Poor** Expect **10 15 MPG** in a stock configuration, making it impractical for daily driving unless you have a large budget for fuel.

3. **Emissions & Modern Compliance** Pre-smog engines like this **cannot legally be driven** in most states without modifications (e.g., smog deletion, EGR deletion, or a modern emissions system). Even if you modify it, some areas still require annual smog checks.

4. **Parts Availability & Cost** While aftermarket support exists, **original Mopar parts (especially for older models) can be expensive or hard to find**. Rebuilding the engine may require sourcing used or aftermarket components.

5. **Potential for Hidden Damage** If the engine has been neglected, issues like **warped heads, cracked blocks, or seized rods** may go unnoticed until it s too late. A thorough inspection (or rebuild) is essential before purchase.

6. **No-Crank or Rough Idle Issues** Many 340 CID engines suffer from **no-crank (starter won t turn) or rough idling** due to weak starters, bad ignition systems, or vacuum leaks. These can be costly to fix.

7. **Transmission & Drivetrain Wear** If the car has high mileage, the **transmission (especially TorqueFlite automatics) and rear end** may need attention. Manual transmissions are more durable but still require maintenance.

8. **Resale Value is Low (Unless Restored)** While enthusiasts value these engines, the general market does not. A restored example may hold value, but a project car with unknown issues will depreciate quickly.

9. **Modern Safety & Comfort Concerns** Many 1970s Mopar cars lack modern safety features (airbags, ABS, modern braking systems). Suspension and steering components may also be worn out.

10. **Time-Consuming Repairs** Unlike plug-and-play modern repairs, fixing issues on this engine often requires **mechanical skill, patience, and specialized tools**. A novice may struggle with common tasks like rebuilding the carburetor or adjusting valves.

---

### **Conclusion & Recommendation**

#### **Who Should Buy This Engine?**

- **Enthusiasts who enjoy mechanical projects** and don t mind spending time restoring or modifying the engine.

- **Drag racers or street rod builders** who prioritize raw power and classic driving feel over fuel efficiency.

- **Collectors or show car owners** who value the engine s historical significance and are willing to invest in its upkeep.

- **Those with a budget for fuel and maintenance** who don t mind poor MPG or occasional breakdowns.

#### **Who Should Avoid This Engine?**

- **Daily drivers** who need reliability, fuel efficiency, and low maintenance.

- **Beginners with limited mechanical experience** who may struggle with repairs.

- **People in states with strict emissions laws** who cannot legally modify the engine for street use.

- **Those unwilling to invest time/money in restoration** if the engine is already failing, it may cost more to fix than it s worth.

If you **love Mopar muscle cars, have mechanical skills, and are prepared for high maintenance costs**, this 340 CID engine is an **excellent choice for a project or performance build**. However, if you **prioritize convenience, fuel economy, or modern reliability**, this engine is **not the best fit** for a daily driver.

- **Get a pre-purchase inspection** (or rebuild the engine yourself) before buying.

- **Budget for a full restoration** if the engine is in rough shape.

- **Consider a modern chassis** (e.g., swapping the engine into a newer frame) if you want a drivable project car.

- **Check local laws** regarding emissions compliance before running it on the street.

For the right buyer, this engine is a **piece of automotive history** but it demands respect and care to keep it running. For the wrong buyer, it can become a **financial and mechanical headache**.

Details:

Original 340 2.02 heads from my 1970 duster, one exhaust valve is stuck and they need to be cleaned up.

part #: gpt2nnd0336aa prices

• $75.00-$159.99

specifications cylinderheapar:

• for models: 340
• for makes: Mopar
• for years: 1970
• mpn: Gpt2nnd0336aa
• type: Cylinder Head Assembly
• manufacturer warranty: 1 Year
• oe/oem part number: 2531894
• material: Cast Iron
• vintage part: Yes
• california prop 65 warning: This Product Can Expose You To Chemicals Including Chromium, Which Are Known To The State Of California To Cause Birth Defects Or Other Reproductive Harm.

seller cylinderheapar:

• city: Seattle, Washington
• rating: 100.0%
• # reviews: 18

shipping cylinderheapar:

• cost: $77.27
• class: Standard
• type: Calculated
• service: FedEx Ground / FedEx Home Delivery
• carrier: FedEx
• transit: 5-11 Days

payments cylinderheapar:

• credit card: Mastercard
• other
• wallet: Paypal

general cylinderheapar:

• Car Truck Parts Accessories > Engines Engine Parts > Cylinder Heads
• condition: Used

offer cylinderheapar:

• options: Ship-to-home
• availability: In Stock
• quantity: 1
• best offers: True
• sold: 0
• started: April 25, 2026

returns cylinderheapar:

• policy: No Returns

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