It's time to replace the spark plugs on my '98 5.0L Expy. Right next to #5 I notice this empty hole - an exhaust manifold bolt somehow worked itself loose and disappeared. Not a big deal... But a 10mmx1.5 wouldn't fit, and
8mm is way too small. Totally baffled, I try a 3/8"x16 standard -- and it fits!!! Yes, I know that the 5.0L V8 engine has a long history, but an imperial thread on a '98 engine? Am I dreaming? Please, guys, save my sanity, quick.- posted
18 years ago