Extended Water Filler Neck SBC/BBC

The Extended Water Filler Neck SBC/BBC from MOROSO is a precision-engineered radiator filler neck designed for small-block and big-block Chevrolet V6 and V8 engines. This component addresses a common cooling system challenge: providing reliable, accessible coolant filling on high-performance and street-driven vehicles where standard water necks may interfere with engine bay components or custom headers. Built from durable aluminum, this 45-degree angled neck stands 5-3/4 inches tall and features a cap-style design that delivers both function and clean aesthetics.

Constructed from aluminum for lightweight reliability and corrosion resistance, the extended water filler neck's 45-degree angle and tall profile allow installers to position the filler point away from exhaust manifolds, intake runners, and custom headers without compromising coolant system integrity. The cap-style design ensures a secure seal while maintaining traditional styling that complements vintage and modern builds alike. At just 0.72 pounds, the neck adds minimal weight while the 4.55 x 3.85 x 9.55-inch dimensions fit within most engine bay configurations. The natural aluminum finish can be left as-is for industrial appeal or painted to match your engine's color scheme.

Street rodders, drag racers, and Chevrolet engine builders benefit most from this water neck when tight engine bay space or modified ignition systems demand repositioning the filler location. Installation is straightforward—the neck threads directly into the intake manifold or cylinder head passage, depending on your engine's cooling configuration. Compatible with both small-block (SBC) and big-block (BBC) Chevrolet applications, this MOROSO product serves as a practical solution for custom cooling setups, turbocharged installations, and restorations where stock water necks simply won't fit.