If you have a set of headers on your 1996-2004 Mustang you have to keep the bolts tight to retain a proper seal. Most header gasket failures are not the fault of the gasket but are due to loose or missing header bolts. BBK header bolts for Ford Modular engine feature a 25mm underhead length, making them them long enough to work with all BBK headers or any other headers with up to a 3\/8 in. flange.


!