Cometic Buick 3.8L V6 Head Gasket 3.860 Bore 1975-87 (5691-066) C5691-066
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Cometic MLS (Multi-LayerSteel) Head Gaskets providemaximum sealing performancefor today's high outputengines and require nosealants. MLS gaskets areideal for both aluminum headsto aluminum blocks andaluminum heads to cast ironblocks. They can withstand theshearing force created by thetwo materials. MLS gasketshave increased strengthbecause they are comprised ofmultiple layers of stainlesssteel; which also creates theability to rebound and resistcorrosion.
The outerlayers are embossed and coatedon both sides with Viton (aflouroelastomer rubber basedmaterial that is heatresistant to 250C/482F). Viton is designedto meet the demands of avariety of harsh sealingenvironments, load conditions,and surface finishes. Thecenter or shim layer isuncoated stainless steel,which can be varied toaccommodate multiple thicknessrequirements.