Unleash the Power: 743 HP Off-the-Shelf Small Block Chevy Build
Table of Contents:
- Introduction
- Background
- Request from Dart
- Off-the-shelf Build
- Maximizing Torque and RPM Band
- Pros and Cons of Off-the-shelf Build
- Cylinder Heads Overview
- Flow Test Comparison
- Engine Specifications
- Dyno Test Results
- Conclusion
🔥 The Power of the Off-the-Shelf Build 🔥
Introduction:
Building a small block Chevy engine can be an exhilarating experience, but what if you could build one with a little twist? In this episode of Power Attack 10, we take on a special project. We received a request from Dart, a renowned name in the industry, to test their introductory 18-degree small block Chevy heads. But here's the catch - we decided to build the engine as an off-the-shelf build. This article will explore the process, challenges, and the results of this unique project.
Background:
Before diving into the details, let's understand the background of this project. Just before the host's brain surgery, Dart approached him with a request to test their 18-degree small block Chevy heads. Equipped with a big inch small block and the necessary parts for testing, our goal was to determine the power capability of these heads for street applications. Thus, the journey began.
Request from Dart:
Dart's request was simple yet intriguing - test their 18-degree small block Chevy heads. These heads were considered their introductory offering, and we were curious to see how they would perform. Building a 421 cubic inch small block Chevy engine was the perfect way to put these heads to the test. With the help of Terry Walters and Jack Sane at Walters Engines, we embarked on this engine-building adventure.
Off-the-shelf Build:
Given the time constraints and our desire to make this project relatable to our viewers, we made the decision to build this engine as an off-the-shelf build. This meant using off-the-shelf parts and following good engine-building practices without extensive modifications. While some machining was done externally, we aimed to keep it as close to a build that anyone could replicate at home. From matching the manifold and checking bearing clearances to using off-the-shelf components, the goal was to showcase the power potential of a street-friendly engine.
Maximizing Torque and RPM Band:
A key focus of this off-the-shelf build was to maximize torque and optimize the RPM band. We aimed to create a pump-gas street driver that delivered exceptional low-end torque while offering enough power at higher RPMs. By carefully selecting the components and considering the compression ratio, camshaft, and other factors, we aimed to strike the perfect balance between power and drivability.
Pros and Cons of Off-the-shelf Build:
Pros:
- Cost-effective: An off-the-shelf build allows you to maximize power without breaking the bank.
- Relatable: By using readily available components, viewers can replicate the build at home.
- Time-efficient: With less time spent on extensive modifications, the project can be completed sooner.
Cons:
- Limited customization: Off-the-shelf builds may limit the ability to fine-tune specific aspects for specific applications.
- Potential compromises: Choosing off-the-shelf parts means accepting the limitations and compromises that come with them.
- Not for extreme builds: If you're looking for ultimate power and performance, a fully customized build may be the better option.
Cylinder Heads Overview:
To understand the performance of the Dart 18-degree heads, it's essential to explore their characteristics. These heads are considered entry-level and offer great bang for your buck. However, we wanted to go beyond hearsay and put them to the test. To start, we conducted a flow test comparison between the Dart heads, a pro-ported head, and the 18-degree heads.
Flow Test Comparison:
The flow test comparison revealed surprising results. The 18-degree Dart heads showcased impressive port volume, valve diameter, and intake center line length. At 800 lift, they touched 340 CFM, which was remarkable considering their price point. On the other hand, the pro-ported Dart heads showed great results as well. Their horsepower and torque made them successful choices for street applications, consistently surpassing 610 horsepower and 538 foot-pounds of torque.
Engine Specifications:
Apart from the cylinder heads, several other components contributed to the performance of this off-the-shelf build. Our engine featured a solid roller camshaft, a Super Victor intake manifold, an AED 1000 CFM carburetor, and a Moroso external oil pump, among other top-quality parts. These components were meticulously selected to maximize power and ensure reliable street performance.
Dyno Test Results:
With the engine assembled and all components in place, it was time for the moment of truth - the dyno test. The results were astounding. We achieved 742.7 horsepower and 617 foot-pounds of torque, with a specific fuel consumption rate that made this engine truly impressive. These numbers demonstrated the power and performance that can be achieved with an off-the-shelf build.
Conclusion:
In conclusion, our off-the-shelf small block Chevy engine build proved that it is possible to achieve high output and exceptional performance without extensive modifications or custom components. The Dart 18-degree heads, in combination with carefully selected components, resulted in a powerhouse of an engine. With a focus on maximizing torque, optimizing the RPM band, and maintaining street drivability, this off-the-shelf build showcases the potential of readily available parts. So, if you're looking to build a powerful small block Chevy engine on a budget, consider the power of the off-the-shelf build.
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