When it comes to engine performance, durability, and long-term reliability, few components matter more than the cylinder sleeve. At PowerBore, high-performance cylinder sleeves aren’t just another part, they’re the foundation of everything we do.

PowerBore is a U.S.-based manufacturer specializing in high-performance cylinder sleeves and liners for automotive, racing, industrial, agricultural, and specialty engine applications. What truly sets us apart, however, is not just what we make, it’s how we make it.

Built In-House, From Melt to Finish

Unlike many cylinder sleeve suppliers that outsource casting or rely on overseas production, PowerBore is one of the very few cylinder sleeve manufacturers in the United States with a fully in-house foundry.

That means every sleeve begins its life under our roof.

By controlling the casting process internally, PowerBore maintains complete oversight of material composition, metallurgical consistency, and quality at every stage. From molten metal to final machining, nothing is left to chance, or to a third party.

This level of vertical integration allows us to:

  • Maintain strict material specifications
  • Ensure repeatable quality from batch to batch
  • Respond quickly to custom requirements
  • Eliminate supply-chain uncertainty

For customers, that translates into confidence, confidence that every sleeve meets the same standards we would demand for our own engines.

Engineered for Performance and Longevity

Cylinder sleeves operate in one of the most demanding environments inside an engine. High heat, extreme pressure, friction, and constant motion leave no room for shortcuts. That’s why PowerBore designs and manufactures sleeves specifically to perform under real-world stress.

Our sleeves are engineered to deliver:

  • Superior wear resistance
  • Excellent heat transfer
  • Dimensional stability under load
  • Long service life in high-performance applications

Whether the engine is built for competition, heavy-duty work, or long-term reliability, PowerBore sleeves are designed to hold up where it matters most.

American-Made, By Choice

PowerBore’s commitment to U.S. manufacturing isn’t a marketing slogan, it’s a business philosophy. Keeping production domestic allows us to protect quality, support skilled American labor, and stay directly connected to our customers.

In an industry increasingly dependent on imported components, PowerBore remains committed to American-made cylinder sleeves produced entirely in-house. This commitment ensures faster lead times, consistent quality, and direct accountability, something offshore supply chains simply can’t match.

More Than a Manufacturer

PowerBore isn’t just a supplier; we’re a manufacturing partner. Our experience working with engine builders, racers, OEMs, and industrial clients allows us to understand the real demands placed on modern engines.

This blog is where we’ll share that knowledge, from technical insights and material science to application-specific guidance and behind-the-scenes looks at how high-performance cylinder sleeves are made.

If performance, durability, and American manufacturing matter to you, you’re in the right place.