When changing head gaskets, do I HAVE to buy anything else? Or is it recomended? on 1999 Ford Expedition

The add ons are what puts the price of repair out of reach for me. I need head gaskets only. The other stuff is good and all that for those that can afford it.

2 answers
u need the upper gasket set
YOU MAY ALSO HAVE CRACKED HEADS SO HAVE THEM CK'D