I'm looking at putting supermaxx long tubes with hi flow cats on my 98 expedition. I'm thinking of going with the header fastener and bolt kit from Summit (part #STG-8906). Has anyone tried these? Do they break like the Ford manifold bolts? Do they really keep the headers from leaking? Any input is most helpful.

 

the headers will come with bolts and gaskets. you shouldnt have any probs i took my stock manifolds off with 103,000 on my 97 and the nut was rusted onto the stud and when i losened it the stud and nut came off all as one. the shorties i have i used the bolts from the kits and the gaskets no probs no leaks no nothing. i think you'll be fine just useing the stuff from the kit.

 

You might want to spray some penetrator on them. Just make sure they are not hot. I MEAN MAKE SURE THEY ARE NOT HOT. and let it soak for a while.