Precision. Passion. Performance.
About us
Founded as ACM, Inc. (American Custom Machining), our company has built a reputation on exacting standards and expert craftsmanship in the world of precision machining. For years, we've served industries that demand nothing less than perfection - from custom automotive parts to intricate prototype components.
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Our work has always been about more than just metal - it's about bringing ideas to life with accuracy, creativity, and pride. With state-of-the-art equipment and decades of hands-on experience, we've carved out a trusted name in high-precision solutions.
Latest News
ACM Visits PRI to Document
Historic Midget
February 2025 - Indianapolis, IN
We visited Performance Racing Industry HQ to take reference measurements of Jeff Gordon's legendary Diet Pepsi midget. This marks the official start of our scratch-built replica project, capturing every detail in scale. Follow the docuseries to see it come to life.
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Watch the Build Series
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The Conley 427 V8 Lives Again
August 2025
ACM is reviving the legendary 1:4 scale Conley 427 V8 back to life-faithfully recreating every phase of its original manufacturing process. From casting and machining to final assembly and test runs, we're documenting it all. Follow the build series as we restore this iconic miniature V8 with the same care and precision that made it a legend.
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Watch the Engine Series
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Every Detail Matters
Introducing Advanced Custom Models
Headline:
A new division of ACM, Inc., Advanced Custom Models showcases our passion for precision-engineered scale models. From historic race cars to legendary engines, each piece is crafted with the same commitment to excellence that defines our machining heritage.
Welcome to ACMPrecision - builders of handcrafted 1:4 scale model cars and custom racing replicas. Every model is precision-engineered in metal and built by hand to replicate legendary sprint cars, midgets, and historic race machines. Whether you're a collector, racer, or a museum curator, our work delivers unmatched detail, craftsmanship, and authenticity.