Radiator Inlet Fitting 1-5/8in x -12AN to 1-3/4

The Radiator Inlet Fitting 1-5/8in x -12AN to 1-3/4 from Northern Radiator is an essential component for custom cooling system builds and high-performance engine conversions. This adapter bridges aftermarket radiator ports and AN-series hose systems, making it indispensable for fabricators upgrading stock cooling circuits or integrating modular radiators into restomod platforms. Whether you're installing a modern aluminum radiator in a classic muscle car or optimizing coolant flow in a turbocharged application, this fitting provides the secure, leak-free connection modern performance engines demand.

Engineered with precision engineering, the Radiator Inlet Fitting features a 1-5/8-inch barbed or threaded inlet that mates to standard radiator tank ports while the -12AN outlet accepts braided stainless steel coolant hoses rated for high-pressure systems. The 1-3/4-inch dimension references the outlet port configuration, ensuring compatibility with AN-12 hose fittings commonly used in racing and modified applications. Northern Radiator's manufacturing standards ensure consistent port sizing and thread integrity, critical when managing coolant temperatures at elevated RPM or boost levels where stock hose connections may fail or restrict flow.

This fitting suits engine swaps, track-prepped vehicles, and cooling system restorations where original equipment connections are incompatible with modern radiators or routing requirements. Install by threading or pressing the inlet into your radiator tank, then secure your AN-12 braided hose with a matching crimp or JIC fitting. Proper installation prevents cavitation, ensures accurate coolant circulation, and eliminates the risk of catastrophic coolant loss during sustained high-load driving. Verify your radiator port dimensions before purchase to confirm compatibility.