Quote:
Originally Posted by Marshall V. Daut
Predictable warpage occurred in the #4 exhaust port, so Ford re-instituted installing the gland rings.
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I'm going to need to see proof of this claim. I don't think it's true and I don't think there's any evidence to support it. If the gland ring decision was reversed because the manifolds were warping, why put them into all four exhaust ports? Wouldn't one ring in #4 have sufficed?
Furthermore I don't think there's any evidence that having or not having gland rings has any effect on warped exhaust manifolds. The warping is adequately explained by the factors described in Vince's article – heat cycling and a design that puts the strain on the manifold outside the area supported by the studs.
It's much more likely that the gland rings were put back in to do what they are designed for: protecting the manifold gasket from superheated exhaust.