Ep 6. Are CNC-Ported Cylinder Heads Worth the Money?

In Engine Masters season 1 episode 6, titled "Are CNC-Ported Cylinder Heads Worth the Money?", the team takes a deep dive into the value of using CNC-ported cylinder heads on your engine. Hosts David Freiburger and Steve Dulcich take on the controversial topic and put it to the test with their own engines to determine if the cost is worth the results.

The episode begins with an introduction to the concept of CNC (computer numerical control) machining. The hosts explain how this technology allows for precise, automated cutting of engine components, including cylinder heads. Dulcich takes on the task of explaining the benefits of CNC-ported cylinder heads, including improved power, torque, and overall performance. However, the team acknowledges that this advanced technology comes at a steep cost and may not be worth it for all budgets.

Throughout the episode, the team tests out several different scenarios to determine the true value of CNC-ported cylinder heads. They start by fabricating a set of heads with various degrees of porting, from mild to aggressive. Using a 5.7-liter HEMI engine, they perform multiple dyno tests to see how each set of heads affects the engine's performance. Additionally, they perform a series of on-track tests to see how the engine performs under real-world conditions.

As the tests progress, the team discovers some surprising results. While the CNC-ported heads do provide a significant boost in power, the gains are not as substantial as some might expect. In fact, the team found that there's a point of diminishing returns – a point where the cost of the heads outweighs the benefit they provide in terms of engine performance. This revelation may come as a surprise to some engine enthusiasts who believe that CNC-ported heads are always worth the investment.

Throughout the episode, Freiburger and Dulcich provide insightful commentary on the science behind porting and how it can be used to improve engine performance. They also provide helpful tips and tricks for those looking to improve their own engines. For example, they explain how a larger throttle body and intake manifold can enhance the flow of air and fuel into the engine, resulting in more power and torque.

Ultimately, the team concludes that CNC-ported cylinder heads can be beneficial for those looking to maximize their engine's performance. However, they caution that the investment may not be worth it for everyone. The episode is a great resource for anyone looking to learn more about the world of engine porting and the science behind engine performance.