Firebird 400 Radiator Outlet Size for 1968

Short answer: To check whether a 1968 400 radiator is original: it should be embossed “HARRISON” on the tanks and have a production usage-code tag (400 codes are UQ and UP). For reference, a “UP” tank measures: upper outlet 1.5625″, lower outlet 1.875″.

Any proposed updates, changes, pictures, and/or corrections, please use our comment section below (may need to click on permalink to access comments feature). Information is subject to change and offered as is without any warranties or guarantees. Please review our Term's Of Use for more information.