Interesting, I've never had trouble with that but I've only messed with a handful of manifolds. I always wondered how the exhaust manifold on the C10 was broken like it was when I bought the truck, it would make a lot of sense if it was from someone getting carried away with a spreader.Outer ears bend in to center over years of heat cycles and bolt holes wont line up .
Spreader pushes them back out . . But dont get gready or SNAP . @mrk5

I have used one a couple of times. Sure beats fighting a manifold the holes won’t line up on.Never would have imagined there's a tool for that.

