Water Outlet Filler Neck

The MOROSO Water Outlet Filler Neck is a straight-design coolant filler for small-block and big-block Chevrolet V6 and V8 engines. This black anodized aluminum water neck replaces worn or corroded original equipment while maintaining OEM-level fitment and sealing integrity on classic and modern Chevy performance builds.

Constructed from stamped aluminum and finished with black anodized coating, this water neck resists corrosion and surface oxidation common in high-heat engine bays and prolonged storage. The cap-style design secures the radiator hose connection while allowing straightforward coolant system servicing. The compact 5.5 x 1.5 x 7.2-inch profile integrates seamlessly into stock and modified engine compartments without requiring custom routing or clearance modifications. At 0.25 lbs, the light weight adds no strain to engine bay weight distribution.

Engine builders and restoration specialists rely on this water neck during cooling system rebuilds, engine swaps, and performance upgrades where original necks are unavailable, damaged, or incompatible with custom headers and manifolds. It serves both street applications and track use where cooling system reliability is non-negotiable. The straight outlet orientation accommodates standard radiator hose sizes and simplifies hose clamp installation compared to angled designs that restrict access in tight engine bays.

MOROSO has engineered this water neck as a direct replacement for OEM Chevrolet cooling components, making it a cost-effective alternative to dealer parts when rebuilding or refreshing Chevy engine cooling systems. The anodized finish extends service life in environments where bare aluminum would pit or corrode.