Bad manifold gaskets

[alexiskai]

Originally Posted by dmaxweb

I've read posts of homemade gland rings made from seamless steel pipe. Do those need to be cut to provide end gap for thermal expansion?

I'm confused. The manifold is cast iron, so the linear thermal expansion coefficient is 5.8. The rings are mild steel, so the coefficient is ~6.5-7.0. That's close enough that the expansion you'd get at normal exhaust temperatures is like going from a slip fit to an interference fit. Unless you're needing to drive your homemade rings in with a hammer, it doesn't seem like you'd need to worry about buckling due to expansion.