Re: Early 1928 Exhaust Manifold Assembly
On a Model T, the rings are used to keep the exhaust manifold from warping. Without the rings the manifold would warp over time so that the holes in the block did not match up with the holes in the exhaust manifold. Cast iron grows slightly when heated and does not shrink back down when it returns to room temperature. Each time it is heated it grows a little more.
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