Borowski Race Engines, Inc., Joliet, IL

Custom CNC Engine Builders for Street, Race & Marine. Est. 1968.

We are engine builders with with a primary focus on high-end LS engines. Our shop has state-of-the-art CNC machinery CNC machinery and engine testing equipment. Our company purchases more Dart LS Next blocks than anyone, including the Big-Box crowd. Needless to say, that translates into a wealth of experience on making the best possible LS engines.

Our engines range from street & strip to top show cars, and from naturally aspirated to boosted. The range of power adders we use includes twin screw and centrifugal superchargers, turbos and nitrous oxide. This provides an incredible range of power and performance options. Most of the engines we build are fuel injected and tuned on our dyno but we also offer remote tuning services to our customers.

We focus on working directly with a limited number of top-quality parts vendors and maintaining inventory of the key parts we use. Our typical short block will feature a Dart block, Callies crank and rods, Diamond pistons. The engines will likely have a COMP cam and Manley valves. If it's big power, the heads are probably All Pro’s. This business model of limited vendors, inventory and common architecture allows us to sell high-end parts, engines and assemblies on short lead times. Other engine builders or parts suppliers may be waiting months for the back-ordered products that we have on the shelf.

Our vendors have been carefully vetted, often with on-site visits to their manufacturing facilities such as shown in these videos shot at All Pro Cylinder Heads, Bullseye Power, Callies, Dart Machinery and Diamond Pistons. We have a strong preference for Made in the USA. These manufacturers need to demonstrate that their products, technology and service are going to help us put out the best possible engines as measured by performance, value, durability and reliability. Our key suppliers provide us with ongoing technical support and often show us their newest technology prior to market introduction. If there is a problem, they’ll take our call and help us work through it. When you buy a Borowski-built engine, you’re getting a product that has a lot behind it.

In the ads below, you will see everything from bare blocks and superchargers to representative complete engine builds that can be ordered and shipped to you. If you don’t see what you are looking for, please give us a call at 815-725-2727 or send an email to [email protected]

Click here for a Virtual Tour of our shop.

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Mon - Fri: 8:00 am - 6:00 pm
Sat: 9:30 am - 1:00 pm

The Benefits of a Borowski-Built Engine

1.Custom Made to Your Exact Specifications: With our guidance, you pick the sound, look, power and accessories. We make it happen.

2.Technical Knowledge: We make cutting edge engines for a broad range of motorsports. In season, our staff is at the track and on the water to help keep you ahead of the pack.

3.Machining Capabilities: Our CNC engine machining equipment and shop professionals are second to none. That shows in our build quality, reliability and performance.

4.Quality: Our levels of care and precision go far beyond OEM or standard aftermarket. Machining and assembly of your project is performed only by highly skilled technicians.

5.Predictability: On-time and on-budget

6.Build Time: Thanks to our CNC processes, we can complete machining quickly. We have strong relationships with our key suppliers which helps avoid delay waiting for parts.

7.Transparency: Your entire build is photographed and documented. Progress pictures are uploaded and viewable on our Flickr. You are welcome to visit in person any time and will be invited to attend the video-taped dyno session.

8.Honesty and Integrity as evidenced by our A+ rating by Better Business Bureau.

9. Our Warranty

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View photos from previous projects at:
https://www.flickr.com/photos/borowskirace/sets/