Billet Filler Neck - Black

The Billet Filler Neck in black anodized aluminum from MOROSO (MPN 63468) is a heavy-duty, bolt-on water neck designed for Chevrolet V6 and V8 engines. This straight cap-style filler neck serves a critical cooling system function: it provides a secure, durable access point for radiator fluid fills while maintaining system integrity under high-pressure conditions. Built to OEM specifications, this component is essential for anyone maintaining or restoring classic and modern Chevy muscle cars, street machines, and high-performance engine builds.

Constructed from billet aluminum and finished in black anodize, the filler neck resists corrosion and thermal stress inherent in engine compartments. The straight design minimizes coolant turbulence during fills, reducing air entrapment that can compromise cooling efficiency. The cap-style interface accepts standard radiator caps, allowing secure sealing of the cooling system. Weighing just 0.35 lbs, this compact component (measuring 5.4 x 1.55 x 7.2 inches) bolts directly to the engine block without modification, making installation straightforward for DIY enthusiasts and professional technicians alike.

This filler neck is ideal for restorations, engine swaps, and high-performance cooling system upgrades on Chevrolet V6 and V8 platforms. Whether you're replacing a corroded original neck or upgrading to a more robust design, the Billet Filler Neck eliminates weak points in the cooling circuit. Compatibility with both small-block and big-block Chevy configurations makes it a versatile choice for engine builders and hot rod fabricators. Proper installation requires torque specifications per Chevy service bulletins; verify bolt pattern and cap threading with your specific engine variant before ordering.