Filler Neck Housing - Billet Alum.

The Filler Neck Housing - Billet Aluminum by MOROSO is a precision-engineered water manifold designed for high-performance cooling systems in Chevy V8 engines. This component serves as a critical junction point in your engine's coolant circulation, consolidating multiple inlet and outlet connections into a single, compact assembly. Engine builders and performance enthusiasts rely on this housing to manage complex coolant flow routing while maintaining system integrity under demanding conditions.

Constructed from billet aluminum and finished in black anodize, this water neck manifold combines durability with corrosion resistance. The housing features a 2-5/16 inch tall profile and accommodates multiple connection standards: one 16 AN female port for high-flow applications, one 1/2 inch NPT female port for standard cooling passages, and dual 1/4 inch NPT female ports for auxiliary connections such as heater cores or temperature sensors. The billet aluminum construction ensures superior strength-to-weight ratio and superior thermal conductivity compared to cast alternatives, while the black anodized finish provides both aesthetic appeal and protective oxidation against coolant degradation.

This manifold is ideal for custom Chevy V8 builds where OEM cooling solutions require modification or when upgrading to larger displacement or high-output configurations. The mixed port configuration allows builders to integrate aftermarket cooling components while maintaining factory-style connections where needed. Installation requires careful port planning to avoid coolant leakage and air pockets; most applications benefit from proper hose sizing and routing verification before final assembly. Weighing just 1.2 pounds, the compact 4.3 x 4.3 x 5.6 inch housing integrates easily into tight engine compartments typical of classic and modern V8 swaps.