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The inner layer on an MLS gasket not only provides a sealing surface for the embossing on the outer layer, but the stainless steel sheet also controls the gasket’s compressed thickness. Notice how the layers are loose except for a rivet holding them together (gold colored in the background). This makes assembling a gasket with different thicknesses relatively easy for the manufacturer and can be a good way for a smart engine builder to adjust compression ratio if he needs to. View Related Article
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