Dual Quad Air Cleaner Ball Milled

The Billet Specialties Dual Quad Air Cleaner Ball Milled (part number 15520) is a premium polished aluminum air intake assembly engineered for high-performance carbureted engines. This dual four-barrel air cleaner features a ball-milled finish that delivers both functional air filtration and show-quality aesthetics, making it ideal for street rods, classic muscle cars, and custom engine builds where intake appearance matters as much as flow efficiency.

The assembly measures 17.5 by 9.375 inches across the oval filter section, stands 3.25 inches tall, and accommodates dual 5-1/8-inch carburetor flanges on a raised base design. This configuration supports twin four-barrel carburetors or compatible dual-carb setups common in big-displacement engines, while the raised base platform allows clearance for manifold linkages and fuel lines. The polished aluminum construction resists corrosion and maintains its finish under engine bay conditions, and the ball-milled texture adds visual depth without compromising structural integrity. Weighing 10.3 pounds, the assembly balances durability with reasonable mass distribution.

This air cleaner suits builders and enthusiasts restoring or modifying classic vehicles with dual-carb induction systems. It serves those seeking a finished, cohesive engine compartment appearance where the intake tract is visible and exposed—common in hot rods, show cars, and vintage muscle car restorations. The dual-quad configuration appeals to owners prioritizing both induction efficiency and visual continuity, as the matched pair of four-barrel carbs creates a signature aesthetic that defines high-performance engine compartments from the muscle car era through modern custom builds.

Billet Specialties maintains recognition within the custom automotive market for precision-machined intake and dress-up components. The ball-milled finish on this assembly represents a signature styling choice that pairs functionality with crafted appearance—differentiating it from standard cast alternatives and signaling attention to detail in engine compartment design.