['68OrangeSunshine]

What Nate says may be true for stock cast iron exhaust manifolds, but threaded studs [3/8''-16 -- 3/8'' -24] with a nut and a support are necessary for steel tube headers. Otherwise they leak bad. I use a hardened steel rocker ball for a spacer. Works for me.

Cervantes was a Spanish Marine. He was captured by Barbary Pirates and held as a POW [slave] for 5 years until his folks and The Church paid his ransom. He started writing after he got back to Spain.