3955270 CHEVROLET Block 427

Review CHEVROLET 4-bolt Main Short Block for 427 1969

Introducing the Chevrolet 3955270 1969 427 4-bolt block, a prized component for muscle car enthusiasts and hot rod builders. This is a genuine General Motors factory block, crafted with precision and durability that only Chevrolet engineering can deliver.

The 427 cubic inch (7.0 liter) 4-bolt block is a legend in the automotive world. It was first introduced in the late 1960s and quickly became iconic due to its powerful performance and robust design. This specific block, the Chevrolet 3955270, is a later production version, maintaining all the desirable characteristics of the original.

The 4-bolt block designation refers to the block's main caps, which have four bolts instead of the standard six. This design offers superior strength and rigidity, which translates into increased engine performance and reliability. The block itself is made of high-quality cast iron, providing the necessary durability to handle the stresses of high-performance applications.

The block comes with a deck height of 9.7 inches and a bore center measurement of 4.45 inches. These dimensions are ideal for building a high-performance engine, as they allow for the use of various crankshaft, connecting rod, and piston combinations. The block also features a raised deck design, which provides clearance for aftermarket high-performance pistons and allows for more efficient combustion.

The block is equipped with a raised water pump boss, making it compatible with aftermarket water pumps and cooling systems. Additionally, it comes with a front oiling system, which ensures that the crankshaft and connecting rods are adequately lubricated, even under high-rpm conditions.

The Chevrolet 3955270 1969 427 4-bolt block is a blank canvas for those seeking to build a high-performance engine. It can be used as a foundation for various engine builds, including big-block Chevrolet V8s, hot rods, and muscle cars. With its legendary status and proven performance, this block is a must-have for any serious collector or builder.

In conclusion, the Chevrolet 3955270 1969 427 4-bolt block is a high-quality and versatile engine component. Its robust design, superior strength, and large displacement make it an excellent choice for those seeking to build a powerful and reliable engine. Whether you're a hot rod builder or a muscle car enthusiast, this block is sure to satisfy your engine building desires.

The Chevrolet 3955270 1969 427 4-bolt block is a popular choice among classic car enthusiasts and muscle car builders due to its powerful engine and historical significance. Here are some pros and cons to consider before making a purchase:

1. Power: The 427 cubic inch V8 engine is known for its raw power and torque. It was originally designed for use in the Chevrolet Corvette and Chevrolet Nova SS, making it a desirable engine for those seeking a high-performance build.

2. Historical Significance: The 427 engine was a part of Chevrolet's W-Series engines, which were introduced in the late 1960s and were known for their power and performance. Owning a 427 block is a way to connect with automotive history.

3. Versatility: The 4-bolt block design allows for greater flexibility when it comes to building and tuning the engine. It can be used for a wide range of applications, from street rods to drag racing.

1. Cost: The price of a 427 4-bolt block can be quite high, especially when compared to other engine blocks. This is due in part to its historical significance and the demand for high-performance engines.

2. Complexity: Building a 427 engine from scratch can be a complex and time-consuming process. It requires a significant investment of time, money, and expertise.

3. Availability: Due to its age and popularity, finding a 427 4-bolt block in good condition can be a challenge. It may require extensive searching and negotiating to find a reliable and affordable block.

The Chevrolet 3955270 1969 427 4-bolt block is a powerful and historically significant engine that is highly sought after by classic car enthusiasts and muscle car builders. However, it comes with a high price tag and the complexity of building it from scratch. Before making a purchase, it is important to carefully consider your budget, expertise, and goals to determine if this engine is the right choice for you.

If you are serious about building a high-performance muscle car and have the necessary resources and expertise, then a 427 4-bolt block may be an excellent investment. However, if you are new to engine building or have a limited budget, it may be worth considering other engine options that may be more accessible and cost-effective. Ultimately, the decision to purchase a 427 4-bolt block should be based on your specific needs, goals, and resources.

Details:

The block has been honed, honed and the decks have square milled. All cylinders have been bored 0.030 over. The connecting rods are the stock dimple style. The water jackets around those cylinders have been partially filled with hard block filler for added strength.

The crank is a forged Chevrolet stock model that has been ground and polished. Here are the details. The sleeves are thick walled and sealed locked into the deck. Restoration only.

APR high performance series main bolts. New cam bearings and freeze plugs have been installed. Per the builder, block should not be used for high cylinder pressures usage or higher rpm. Number 2 and 7 cylinders have been sleeved due to factory thin walls.

The block number is 3955270. This is 1969 Chevrolet 427 big block 4-bolt main short block.

specifications engineblocksam:

• for models: 427
• for years: 1969
• brand: Chevrolet
• mpn: 3955270
• type: Engine Block
• material: Cast Iron
• vintage part: Yes
• finish: Painted

offer engineblocksam:

• started: may 6, 2025
• options: ship-to-home
• availability: in stock
• prices: $249.74–$2250.00
• item condition: Used
• sold #: 19
• in stock #: 5

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• rating: 100.0%
• # reviews: 61
• city: hamilton, montana

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• category: Auto Parts > Car Truck Accessories > Engines > Blocks

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