I am not sure what properly tightened is for these headers. At first it felt too loose, so we tightened it down until it was really tight, and then it kept leaking.
Eddie, those aren't washers, those are the springs that came with the stock hardware.
wow i see now my bad lol
97 GTP DD, 1952 Ford F-1 Resto Project, 2006 Mustang GT "UnDeR CoNsTrUcTiOn", 02 GPGT SOLD!, 98 GTP Parted/Scraped