Dart Machinery has announced that its Iron Eagle Heads have been officially approved for United States Racing Association (USRA) Limited Mod class racing.

The new addition to the rulebooks helps builders and racers secure readily available, US-made cylinder heads for competition use.

Dart's Iron Eagle line focuses on affordability, quality and performance and is designed for street builders and racers alike, according to a press release.

The USRA approved part number (10024360) features 1.940in/1.500 in valve sizes, 165 cc high-velocity runners and is available bare or with 1.250in single springs for hydraulic flat tappet cams. The assembly includes stainless steel valves, premium springs, locks, retainers, and seals.

USRA was formed with a mission of growing local and regional dirt track racing through cost-effective rules. USRA currently sanctions four divisions, Modifieds, stock cars, B-Mods and Hobby Stocks.

For more information, visit dartheads.com.