Headers: Old's 77-80 w/ 403 V8These are the best fitting headers we can locate for the 403 Olds, LHD or RHD as found in the 77 79 Firebird TA series. Black steel headers from Flowtech a leading Exhaust USA specialist. These headers are computer bent and leak tested, have die cut exhaust port flanges, and machine formed and hand welded primary tube ends. Heavy part.. Delivery additional. Most importantly.. they're specifically made to the LHD 403 Olds as found in the Firebird &