High Efficiency Cores suggested for the 1958 series to amply cool stock and upgraded engines.<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. <br><br><br>Copper Brass all metal original style radiator is built to order in the USA. Allow 4-6 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>Made for 348 engine. <br><br>Country of Manufacture United States<br>Make / Model Chevy Impala<br>Year(s) 1958<br>Engine V8 348<br>Notes 3 Row HE <br>Material Copper/Brass<br>Core Size 19-3/4 x 19-1/4<br>Available Rows 3<br>Core Thickness 2 Inch<br>Cooler Size 12-1/2x1/4 NPT<br>Flow Type Downflow<br>Inlet Size 1-1/2"<br>Outlet Size 1-3/4"<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.