Our headers - which we developed for the SB 350 / 400 Crate and then advanced for the BB model - are correct and do not need modification. They ride bicycles. We dont. You can see that ours are correct , and also our collector is angled so you dont have interference with the block
Great for all BIG BLOCK CAMARO FIREBIRD and other apps with BB Rat Motors.
True Laser cut flanges TO4E FLANGE Front Mount style , with correct orientation 1.9MM thick