4 Hose Connections (2 upper, 2 lower for Flathead engines). We will contact you after purchase to confirm what OD diameter you require on this custom build. <br><br>This build features a HE = HIGH EFFICIENCY copper core. This design utilizes 1/2 tubes on 3/8 center to provide 20% more heat transfer points than a traditional core. In a nut shell, it will come in the same thickness as an OEM 3 row but provide the cooling capacity of a 4 row.<br><br>Copper Brass all metal original style radiator is built to order in the USA. Allow 4 week build time. Item will be made with automatic transmission. For manual, specify upon ordering.<br>Purchaser is required to match illustration, thickness and measurements prior to purchase to ensure fitment. Item sold as illustrated and described disclosing model information is added as a reference. Custom built items are non returnable (12 month exchange warranty included)<br><br>Country of Manufacture United States<br>Make / Model Mercury 1939-1956 Car<br>Year(s) 1949-51<br>Engine V8 Flathead<br>Notes 4 Hose Connections, Specify Hose Sizes and Locations<br>Material Copper/Brass<br>Available Cores Standard Automotive<br>High Efficiency<br>Core Size 18-3/4 x 25-3/4<br>Available Rows 4<br>Cooler Size N/A<br>Flow Type Downflow<br>Inlet Size Please Specify<br>Outlet Size Please Specify<br><br>Copper 80's style core with 1/2" tubes on 3/8" centers. Increased cooling efficiency without modifications to car. High Efficiency offers more cooling efficiency than aluminum cores due to tubes on 3/8" centers. Copper/brass construction to ensure dependability.