If you're chasing horsepower, reliability, or a one-off part that nobody else will touch, these five machine shops deliver precision and performance. From garage-built startups to full-scale racing operations, here's where to send your next engine build.
The State of Custom Engine Machining
Custom engine machining has evolved from a niche craft into a high-tech discipline where blueprinting, CNC work, and material science meet old-school craftsmanship. Shops today handle everything from LS swaps to vintage rebuilds, with services like Darton sleeving, line boring, and custom fabrication becoming standard. Whether you're building for the street, strip, or track, the right machine shop can make or break your project. The best operations combine decades of experience with modern equipment, and they're not afraid to tackle the jobs others pass on.
How We Evaluated These Shops
We looked at each shop's service scope, from basic machining to full custom builds, and how clearly they communicate their capabilities and pricing. We considered their local fit, meaning how well they serve enthusiasts in their region and beyond, plus their reputation for precision and problem-solving. We also noted their willingness to handle specialized work like sleeving, fabrication, and performance upgrades. Each shop stood out for different reasons, whether it was a family-run legacy, a focus on racing, or a garage-to-garage story that resonates with DIYers.
Here's a quick look at the five shops, ranked by our overall assessment of their offerings and fit for different types of projects.
| Provider | Best For |
|---|---|
| BES Racing Engines | Drag racing engine builds and precision machine work |
| Home - AnderFab Machine | Custom builds and performance upgrades for street and track |
| Performance Automotive Machine Shop & Racing Engines | Complete engine builds and vintage rebuilds with a family touch |
| Performance Automotive | CNC blueprinting and precision machining for race and marine engines |
| Prestige Engine Machine Shop | Custom engines for automotive and marine applications |
The Shops, Closer Look
#1 BES Racing Engines
A screenshot of the BES Racing Engines website.
BES Racing Engines is a dedicated high-performance drag racing shop that lives and breathes quarter-mile builds. They offer a full suite of machine shop services, including balancing, crank grinding, head porting, and sheet metal intake fabrication, all tailored to custom racing engines. Their pricing is transparent, with hourly rates and specific service costs listed, which is rare in this industry. If you're building a class motor or need Darton sleeves for an LS, Modular, or Coyote, BES has the expertise and equipment. They also provide dyno services, so you can see your numbers before you hit the track. For serious racers, this is a one-stop shop that doesn't mess around.
#2 Home - AnderFab Machine
A screenshot of the Home - AnderFab Machine website.
AnderFab Machine started as a garage project in 2010 and has grown into a full-on machine shop that builds engines to dominate the street, strip, and track. They specialize in engine machining and rebuilds, including blueprint boring, honing, balancing, and head work, plus custom fabrication for one-off parts. Their performance upgrades cover superchargers, pump gear setups, and high-performance mods that hit harder. What sets them apart is their hands-on approach and willingness to tackle projects others won't, like sleeving LS blocks with Darton sleeves and vapor honing. They're not just a shop; they're problem-solvers who live for performance. If you want a builder who treats your engine like their own, AnderFab is a solid choice.
#3 Performance Automotive Machine Shop & Racing Engines
A screenshot of the Performance Automotive Machine Shop & Racing Engines website.
Performance Automotive Machine Shop & Racing Engines, owned by Bob Myers and family, brings over forty years of combined experience to every build. They offer complete in-house machine shop services, custom racing engines, complete engine builds, and even diesel and vintage engine rebuilds. Their Greeneville, Tennessee location serves clients nationwide, and they pride themselves on strict tolerances and proven combinations. Whether you're after a race-ready engine or a reliable street rebuild, their family-run operation ensures personal attention. They also stock racing engine parts and offer wholesale options, making them a convenient source for components. If you value experience and a personal touch, this shop is hard to beat.
#4 Performance Automotive
A screenshot of the Performance Automotive website.
Performance Automotive in Bethalto, Illinois, is a 6,000-square-foot state-of-the-art facility that goes beyond typical machine shop capabilities. They use CNC block blueprinting machining centers and computer simulation programs to achieve exacting tolerances, even on brand-new components. Their services include Darton sleeve installation, CNC blue printing, and assembly for circle track, drag racing, marine, and high-performance engines. With over 70 years of combined experience across three generations, they bring a wealth of knowledge to every project. They're particularly strong on improving OEM tolerances by machining from crankshaft and camshaft centerlines, not just the pan rail. If you're looking for precision that exceeds factory specs, this shop delivers.
#5 Prestige Engine Machine Shop
A screenshot of the Prestige Engine Machine Shop website.
Prestige Engine Machine Shop, part of Prestige Motorsports, focuses on precision machining for high-performance automotive and marine engines. They offer custom engine builds across Chevy, Ford, Mopar, and LS platforms, plus marine engines for offshore and workboat applications. Their services include custom fabrication, dyno testing, and remote tuning, making them a versatile partner for both car and boat enthusiasts. They also provide turnkey packages that bundle engines with transmissions, cooling, and fuel systems for a complete solution. If you're looking for a shop that can handle everything from a street build to a marine upgrade, Prestige has the scope. Their approach is performance perfected, with a clear focus on quality and customer satisfaction.
How to Pick the Right Machine Shop for Your Build
Start by defining your goals: are you building for the street, strip, or track? That will narrow down which shop's specialty aligns with your needs. Look for a shop that offers the specific services you require, whether it's Darton sleeving, CNC blueprinting, or custom fabrication. Check their experience with your engine platform, like LS, big block Chevy, or Ford Modular. Consider their location and whether they can handle shipping or if you prefer a local drop-off. Finally, ask about their process and how they communicate—good shops are transparent about timelines and costs. Don't be afraid to ask for references or examples of similar builds they've completed.
Streamlining Your Engine Build Process
Once you've chosen a shop, the build process can be streamlined with a few steps. First, document your engine's current condition and your performance goals, then share that with the shop to get a clear quote. Next, schedule a teardown and inspection to identify any hidden issues, like block cracks or worn components. Then, work with the shop to select parts and machining services that fit your budget and power targets. Finally, agree on a timeline for machining, assembly, and dyno testing, and stay in touch for updates. Many shops offer remote tuning or consultation, so you can fine-tune after the build. This approach ensures you get the most out of your investment with minimal surprises.
The Bottom Line on Custom Engine Shops
No matter which shop you choose, the key is finding a partner who understands your vision and has the skills to execute it. From AnderFab's garage-to-garage story to BES's racing pedigree, each of these shops brings something unique to the table. Whether you need a streetable rebuild or a full-blown race motor, these five are worth considering. Take your time, ask questions, and pick the one that feels right for your project. Your engine—and your driving experience—will thank you.