The 350 short block with a 4 bolt main configuration is a popular choice among automotive enthusiasts and builders due to its strength and performance capabilities. This engine type is particularly favored for high-performance applications, including racing and custom builds.

350 Short Block Overview

The 350 short block refers to the core assembly of the engine, which includes the block, crankshaft, connecting rods, and pistons. The designation "4 bolt main" indicates that the engine features four bolts securing each of the center three main caps, enhancing its structural integrity. This design is crucial for applications that demand higher horsepower and torque.

Benefits of a 4 Bolt Main

  • Increased Strength: The additional bolts provide greater clamping force on the main caps, which helps prevent movement under high-stress conditions.

  • Better Performance: Ideal for performance builds, especially those running forced induction or nitrous, as it can handle increased loads without failure.

  • Durability: The 4 bolt configuration is less prone to cracking compared to 2 bolt mains, making it suitable for long-term use in demanding environments.

Technical Specifications

When considering a 350 short block with a 4 bolt main, here are some important specifications to keep in mind:

SpecificationDetails
Displacement350 cu. in. (5.7L)
Bore x Stroke4.000 in. x 3.480 in.
Compression RatioVaries (typically around 9.0:1 to 10.5:1)
Power OutputUp to 420 hp (depending on configuration)
Torque OutputUp to 408 lb-ft

Applications

The 350 short block with a 4 bolt main is versatile and can be used in various applications:

  • Street Performance: Ideal for muscle cars and street rods looking for enhanced power.

  • Racing: Commonly used in drag racing and circle track racing due to its ability to withstand high RPMs and loads.

  • Custom Builds: Popular among builders looking to create high-performance engines tailored to specific needs.

FAQs About 350 Short Block 4 Bolt Main

    • What is the difference between a 2 bolt and a 4 bolt main?
      A 4 bolt main has two additional bolts securing each center main cap, providing greater strength and stability under high loads.

    • Can I use a 2 bolt main block for high-performance applications?
      Yes, but it is generally recommended to use a 4 bolt main block for applications exceeding moderate horsepower levels or when using forced induction.

    • What should I consider when building a performance engine?
      Consider factors such as compression ratio, intended use (street vs. racing), and whether you will be using nitrous or a supercharger.

The 350 short block with a 4 bolt main is an excellent option for those seeking durability and performance in their engine builds. Its robust design makes it suitable for both street and race applications, ensuring that it can handle the demands of high-performance driving.