Tripleflow = Coolant is routed through the core 3 times to maximize cooling. More detail on this core design below.<br><br>This will outperform any all aluminum option on the market and is suggested for high horsepower applications.<br><br>All triple flow radiators are made without internal transmission cooler (use external coolers)<br><br><br> 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>Copper Brass all metal original style radiator is built to order in the USA. Allow 4-6 week build time. <br><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 Fluid flows through 3 times<br>4 Row Has 20-3/4" Tall Core w/Flat Header<br>Material Copper/Brass<br>Core Size 20 3/4 x 19-1/4<br>Available Rows 4 HE CORE TRIPLE PASS<br>Core Thickness 2 5/8 Inch<br>Cooler Size NONE (Cannot use with triple pass)<br>Flow Type Downflow<br>Inlet Size 1-1/2"<br>Outlet Size 1-3/4"<br><br>High Efficiency Tripleflow Core Highlights<br><br>By re-routing the coolant through the core three times the coolant travels farther in the temperature reducing air-flow and the additional time spent dropping temperature results in amazing heat transfer rates. Copper/brass construction to ensure dependability. <br><br>(note: Tripleflow option requires that inlet and outlet be on opposite sides and must use auxiliary tranny cooler for automatic transmission vehicles)