Exhaust manifold glands

[nkaminar]

The Model T exhaust manifold would warp without the glands. Cast iron will expand when repeatedly heated. The exhaust manifold on the Model T was designed with more metal on the top so that it would warp down at the rear over time and the rear hole would not be aligned. The Model A exhaust manifold is a lot better design and will not warp nearly as much. Even so, some additional material was added in 1931. The glands are a carryover from the Model T.