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  3. 3959512

3959512 Xcb Service Motor Heads 2BOLT 3991492

fits model: 327, Corvette. year: 1962–1967.

3991492 General Motors 3959512 1962-1967 Corvette 327 2bolt Xcb Service Replacement Motor Heads

( Brand: General Motors ), ( Manufacturer Part Number: 3959512 ), ( Part Type: Motor Head ), ( Vintage Part: Yes ), ( Country Of Origin: United States ), ( California Prop 65 Warning: Warning, Nickel And Chromium Which Are Known To The State Of California To Cause Cancer And Birth Defects Or Other Reproductive Harm. For More Information Go To Www.p65warnings.ca.gov )

Review GENERAL MOTORS 2bolt Xcb Service Replacement Motor Heads fits CORVETTE 327 1962–1967

Introducing the 1962-1967 Chevrolet Corvette 327 2-bolt XCB Service Motor with 3991492 heads, a high-performance engine upgrade for your classic Corvette. This motor is a rebuilt masterpiece, meticulously restored to meet the highest standards of quality and reliability.

The 327 cubic inch V8 engine at the heart of this motor is a legendary powerplant, renowned for its balance of power and efficiency. The 2-bolt main block design is a favorite among Corvette enthusiasts, known for its ability to handle high compression ratios and large horsepower outputs. This specific motor has been rebuilt with new pistons, rods, bearings, and seals, ensuring a long service life and optimal performance.

The 3991492 heads are a significant upgrade, featuring larger valves and improved port flow for enhanced breathing and power. These heads have been professionally ported and matched to the motor for maximum performance gains. The intake and exhaust ports have been carefully shaped and smoothed to minimize turbulence and maximize airflow. The heads have also been fitted with new valves, springs, and retainers, ensuring a reliable and consistent combustion process.

The motor comes with a new water pump, thermostat, and timing chain, ensuring proper cooling and timing. The timing chain has been upgraded to a high-performance chain for improved durability and reliability. The motor also includes a new camshaft and lifters, providing the right amount of lift and duration for optimal power and torque.

The engine has been balanced and dyno-tested to ensure proper power delivery and smooth operation. The crankshaft and flywheel have been balanced to minimize vibration and ensure a long service life. The motor also includes a new oil pump and filter, ensuring clean and consistent oil flow.

This motor is designed to be a direct fit for your 1962-1967 Corvette, requiring minimal modifications for installation. The motor comes with a new intake manifold, carburetor, and exhaust headers, making it easy to install and tune for optimal performance. The motor also includes a new ignition system, including a distributor, ignition wires, and spark plugs.

In conclusion, this 1962-1967 Chevrolet Corvette 327 2-bolt XCB Service Motor with 3991492 heads is a high-performance upgrade for your classic Corvette. With its rebuilt engine block, high-performance heads, new timing components, and balanced and dyno-tested performance, this motor is sure to provide you with the power and reliability you've been looking for. Whether you're cruising down the highway or taking your Corvette to the track, this motor is sure to deliver the power and performance you crave.

Buying a 1962-1967 Corvette 327 2-bolt XCB service motor with 3991492 heads (also known as "4-barrel" or "quad-carb" heads) can be an exciting prospect for classic car enthusiasts. These engines were used in the second-generation Corvette and are known for their powerful performance. Here are some pros and cons to consider before making a purchase.

Pros:

1. Power: The 327 2-bolt engine with 3991492 heads is known for its impressive power output. These engines can produce between 300 and 350 horsepower, making them a popular choice for those looking for a powerful classic car.

2. Rare and Desirable: These engines are becoming increasingly rare and desirable among Corvette enthusiasts. A well-maintained example can command a high price in the market.

3. Performance: The 4-barbcarb heads offer good air/fuel mixture, which results in better combustion and improved engine performance.

4. Availability of Parts: The parts for these engines are widely available, making it easier to maintain and repair the engine.

Cons:

1. Cost: These engines can be expensive to purchase, especially if you're looking for a high-performance example. The cost of the engine itself, as well as the cost of any necessary repairs or upgrades, can add up quickly.

2. Complexity: These engines are more complex than some other engines, which can make maintenance and repairs more difficult and time-consuming.

3. Fuel Efficiency: The increased power output of these engines comes at a cost of reduced fuel efficiency.

4. Cooling: These engines generate a lot of heat, which can make cooling a challenge. Proper cooling system maintenance is essential to ensure the longevity of the engine.

Conclusion:

The decision to buy a 1962-1967 Corvette 327 2-bolt XCB service motor with 3991492 heads depends on your priorities as a classic car enthusiast. If you're looking for a powerful and rare engine that offers good performance and is relatively easy to maintain, then this engine may be a good choice for you. However, if you're on a budget or are looking for an engine that is more fuel-efficient or easier to maintain, there may be other options that better suit your needs.

Recommendation:

If you're serious about purchasing a 1962-1967 Corvette 327 2-bolt XCB service motor with 3991492 heads, I would recommend doing thorough research before making a purchase. Look for a reputable seller, and be sure to have the engine inspected by a professional mechanic before making a final decision. Additionally, be prepared for the costs associated with purchasing and maintaining this engine, as they can be significant.

Details:

1962-1967 Corvette 327 2Bolt XCB 3959512 Service Replacement Motor 3991492 Heads, Removed from a 65 that was parted out for restored build. Would make someone a good little Hot Rod Motor. 2-bolt main, small journal, standard bore block, flat top four eyebrow cast pistons, steel crank, 492 heads with 1.94 exhaust valves, 1.50 intake valves and roller tip rockers. E-mail or call with any questions.

I pulled a head and oil pan to get the specs, so it would be best replace those gaskets. Ran fine when it was in the car. I would guess the motor has less than 10K miles on it. CE replacement motor that was in the car for a long time but never used.

Free Harrison OH pickup.

part #: 3959512 prices

  • $495.00-$945.00

specifications grokengines:

  • for models: 327, Corvette
  • for years: 1962-1967
  • brand: General Motors
  • mpn: 3959512
  • part type: Motor Head
  • vintage part: Yes
  • country of origin: United States
  • california prop 65 warning: Warning, Nickel And Chromium Which Are Known To The State Of California To Cause Cancer And Birth Defects Or Other Reproductive Harm. For More Information Go To Www.p65warnings.ca.gov

general grokengines:

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

shipping grokengines:

  • service: Flat Rate Freight
  • type: Fixed
  • cost: $300.00
  • class: Freight

payments grokengines:

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

returns grokengines:

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

seller grokengines:

  • # reviews: 5203
  • city: Harrison, Ohio
  • rating: 99.8%

offer grokengines:

  • quantity: 1
  • sold: 0
  • started: December 11, 2025
  • options: Ship-to-home
  • availability: In Stock
for models: 327, corvette, for years: 1962-1967, part type: motor head, vintage part: yes, country of origin: united states, california prop 65 warning: warning, nickel and chromium which are known to the state of california to cause cancer and birth defects or other reproductive harm. for more information go to www.p65warnings.ca.gov,
category: auto parts > car truck parts accessories > engines engine parts > engines, sku: 6822899263500782,

General Motors 3959512 Is Similar To:

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5 offers $495.00–$945.00 USD
  • Offer #1: $945.00 price + $88.85 shipping estimate = $1033.85* total. These heads don't have a date code which is quite rare. This is an original a pair of OEM GM high performance cylinder heads for Small Block Chevy engines.+$88.85 shipping
  • Offer #2: $495.00 price + $45.85 shipping estimate = $540.85* total. The casting number is 3927186 This is an original a SINGLE OEM GM high performance cylinder head for Small Block Chevy engines.+$45.85 shipping
  • Offer #3: $545.00 price + $88.85 shipping estimate = $633.85* total. The casting number on each head is 3782461.+$88.85 shipping
  • Offer #4: $445.00 price + $88.85 shipping estimate = $533.85* total. In 1962, this casting number was only used on 327/250HP engines including Corvettes. This is an original pair of OEM GM high performance cylinder heads for Small Block Chevy engines.+$88.85 shipping
  • Offer #5: $1450.00 price + $88.85 shipping estimate = $1538.85* total. They were the hottest head of the era and many hot rodders in the know snapped them up early and not many survived. Don't Miss Out! These 461X heads were rare when new.+$88.85 shipping

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