Billet Water Neck 20AN Black

The Billet Water Neck 20AN Black from Allstar Performance is a precision-engineered coolant distribution component designed for custom cooling system builds and high-performance engine modifications. This aluminum water neck serves as the critical junction between your radiator hose and engine block, allowing you to relocate and customize your cooling system plumbing to accommodate aftermarket headers, tight engine bay configurations, or upgraded water pump installations. Whether you're building a street rod, race engine, or modernizing classic car cooling, this component provides the directional flexibility and durability your project demands.

Machined from solid billet aluminum and finished in black anodize, this water neck eliminates the brittleness and corrosion issues associated with cast iron originals. The 20AN port designation accommodates -20 AN hose fittings, which deliver superior pressure ratings and leak-free connections compared to standard barbed hose connections—essential for high-temperature, high-flow cooling circuits. The compact 5.35 x 3.45 x 6.85-inch profile allows strategic placement in tight engine compartments without sacrificing flow capacity or requiring extensive modifications to existing engine dress-up components.

Mechanics and fabricators building small-block Chevrolet, Ford, and Mopar engines benefit most from this versatile fitting, as it eliminates fitment conflicts with modern serpentine belt systems and aftermarket intake manifolds. Installation pairs seamlessly with -20 AN hose assemblies and requires thread-sealing compound for dry-fitting applications. The lightweight 1.24-pound design contributes negligibly to engine bay weight while providing the structural integrity needed for sustained track use or aggressive street driving where cooling system reliability is non-negotiable.