Description NEW 2 Valve Cover Rubber Steel Core Gasket For SBC 283 305 327 350 400 Small Block Chevy. Specification: New & High Performance Direct Replacement. Strict quality control standards to Build and test Same with OEM one Steel core Blue rubber valve cover gaskets 3/16 thick Made of rubber with steel core insert Reusable, no sealant required Excellent for steel or aluminum valve covers Color: Blue. Fits all sb Chevy 283-327-350-383-400 engines.