Car TipsHow To

How to Bore a Throttle Body

The throttle body is an essential component of the engine that regulates the amount of air entering the combustion chamber. It is a valve that controls the airflow, and its size plays a significant role in the engine’s performance. Boring the throttle body is a process that can increase the airflow, resulting in improved performance. In this article, we will discuss how to bore a throttle body.

H2: Required Tools and Materials Before you start the process, you need to gather the necessary tools and materials. Here is a list of what you’ll need:


  • Drill Press
  • Metal drill bits
  • Dremel tool
  • Sandpaper
  • Measuring calipers
  • Vice


  • Throttle body gasket
  • Masking tape
  • Carburetor cleaner
  • Lubricating oil

Step-by-Step Process

Step 1 – Remove the Throttle Body The first step is to remove the throttle body from the engine. Make sure the engine is cold and turned off. Disconnect the air intake hose, throttle position sensor, and any other components attached to the throttle body. Remove the throttle body from the engine using a wrench or socket set.

Step 2 – Secure the Throttle Body Place the throttle body on a flat surface and use a vice to secure it firmly. Make sure the throttle plate is closed and locked in place.

Step 3 – Measure the Throttle Body Use a measuring caliper to measure the inside diameter of the throttle body. Record the measurement on paper.

Step 4 – Masking Tape Cover the throttle body with masking tape, leaving about 1/8″ of the throttle body exposed. The tape will protect the throttle body from scratches and help guide the drill.

Step 5 – Drilling Using a metal drill bit, drill a hole into the throttle body at a 45-degree angle. Start at the tape and slowly work your way to the center of the throttle body. Repeat the process until you have drilled several holes.

Step 6 – Dremel Tool Using a Dremel tool, smooth out the edges of the holes you drilled. Be careful not to remove too much material.

Step 7 – Sanding Using sandpaper, sand the inside of the throttle body until it is smooth. Remove all the tape and clean the throttle body using carburetor cleaner.

Step 8 – Reinstalling the Throttle Body Before reinstalling the throttle body, clean the surface of the engine where the gasket will be placed. Install a new throttle body gasket and carefully place the throttle body back onto the engine. Reconnect all the components that were disconnected in step 1.


Boring a throttle body is a simple process that can improve your engine’s performance. By increasing the airflow, you can achieve better acceleration and overall performance. With the right tools and materials, you can easily complete this task at home. However, it is essential to exercise caution and follow all safety guidelines to prevent any accidents.

Rachael McAdams

I'm Rachael, CEO of AutoGeeX, bring unrivaled expertise and passion to the automotive industry. With extensive knowledge and a deep understanding of cars, she shares captivating tales, invaluable insights, and practical tips with readers. As an active presence in the car community, Rachael ignites excitement, revolutionizing the automotive landscape with AutoGeeX's pursuit of perfection.

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