CHEVROLET 3998991 Block Cylinder Heads

( Manufacturer Part Number: 3998991 ), ( Part Type: Block Cylinder Head )

Review CHEVROLET Small Block Rebuilt Cylinder Heads fits MONTE CARLO IMPALA CHEVELLE 400

The 3998991 400 Chevrolet block and cylinder heads are a set of high-performance components designed for the classic Chevrolet Monte Carlo, Impala, and Chevelle models. These components are built to provide exceptional power and reliability, making them a popular choice among enthusiasts and restorers.

The block is a cast-iron unit that features a 4-bolt main bearing cap design for added strength and durability. It has a bore size of 4.00 inches, which allows for the use of larger pistons and cylinder heads to increase engine displacement and horsepower. The block is also equipped with a forged crankshaft and connecting rods to handle the increased power and torque.

The cylinder heads are also cast-iron units that are designed to work seamlessly with the 400 block. They feature a 2.02-inch intake valve and a 1.60-inch exhaust valve, which provide excellent airflow and combustion efficiency. The heads are also equipped with a single-plane intake manifold port design, which helps to improve engine breathing and power output.

The 3998991 400 Chevrolet block and cylinder heads are also compatible with various fuel systems, including carburetors and fuel injection. They are also designed to work with various camshaft and valve train configurations, allowing for a wide range of performance tuning options.

In summary, the 3998991 400 Chevrolet block and cylinder heads are a high-performance set of components that are designed to provide exceptional power and reliability for classic Chevrolet Monte Carlo, Impala, and Chevelle models. They are built with a 4-bolt main bearing cap design, forged crankshaft, and connecting rods, and feature a 2.02-inch intake valve and a 1.60-inch exhaust valve. The heads are also compatible with various fuel systems and camshaft and valve train configurations, making them a versatile and popular choice among enthusiasts and restorers.

1. High Power: The 400-cubic-inch engine is known for its power and performance, making it a popular choice for muscle cars.

2. Wide Availability: As a common engine for these models, replacement parts are widely available, making repairs and maintenance easier and more cost-effective.

3. Compatibility: The cylinder heads are compatible with a wide range of Chevrolet models, providing flexibility for vehicle upgrades and modifications.

1. Cost: While replacement parts are widely available, the cost of rebuilding or upgrading a 400-cubic-inch engine can be high due to the engine's size and performance capabilities.

2. Complexity: The 400-cubic-inch engine is a complex system, requiring a certain level of mechanical knowledge and expertise to maintain and repair properly.

3. Age and Condition: If the engine is old or has been poorly maintained, it may have underlying issues that could require additional repairs or replacement parts.

If you're looking for a powerful and reliable engine for your Monte Carlo, Impala, or Chevelle, the 3998991 400 Chevrolet block cylinder heads could be a great option. However, it's important to consider the cost of upgrades and maintenance, as well as your own mechanical abilities, before making a decision. If you're unsure, it may be worth consulting with a professional mechanic to get a better understanding of the potential costs and challenges involved.

If you're interested in upgrading your engine, it may be worth considering a 400-cubic-inch engine with newer components, such as modern pistons, rods, and cylinder heads, to ensure optimal performance and reliability. Alternatively, you could consider a smaller engine with similar power output, which may be more cost-effective and easier to maintain in the long run. Ultimately, the best choice will depend on your specific needs and budget.

Details:

50 diameter exhaust valves. They are the heavy castings so not problem with cracking in light. 94 diameter intake valves and 1.

Head surfaces are CNN machined. Heads are date coded k 21 4 and these have the 6 steam holes for 400 engines but will also work great on 327, 350 or 383. 010 for optimum gasket sealing.

Heads are fitted with Valve springs will accept camshaft lift up. Heads are ready to install. Assembled with new perfect circle positive Teflon intake seals and Vito umbrella on the exhaust.

part #: 3998991 prices

• $100.00-$475.00

specifications cylinderheapar:

• for models: 400, Monte, Carlo, Impala, Chevelle
• for makes: Chevrolet
• mpn: 3998991
• part type: Block Cylinder Head

Offer cylinderheapar:

• quantity: 1
• bids: 0
• Started: April 10, 2018, 12:17 pm
• best offer: false
• Sold: 0

General cylinderheapar:

• in stock: Yes
• motors > partsaccessories > vintage cartruck parts > enginescomponents > cylinder headsparts engines components
• condition: Remanufactured

Ratings:

1. Great communication. A pleasure to do business with. 03-26-18
2. Fantastic merchant 04-04-18
3. Quick response and fast payment. Perfect! THANKS!! 03-26-18
4. Hope to deal with you again. Thank you. 03-26-18
5. Super FastExcellent product. Thank you! 04-04-18

Shipping cylinderheapar:

• cost: $90.0
• handling: 1 days
• type: Flat

Seller cylinderheapar:

• zipcode: 50401
• city: Mason City, Iowa

Payments cylinderheapar:

• CashOnPickup
• PayPal
• MOCC

Returns cylinderheapar:

• time: 14 Days
• paid by: Buyer
• policy: returns accepted
• type: Money Back

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