Ports measure 2.750" x 2.250" and are oval port and racer will most likely have to do some final blending once the headers are all welded up. Header flanges should fit most BAE, AJ, Total Flow, Co-Line and most other Fat head type cylinder heads. Will fit BAE 5 thru 10 heads.
Each flange weights two pounds and RBS carries a full line of copper exhaust gaskets to compliment your bitchin new pipes.