Ultra-Seal is Mr. Gasket premium valve cover gasket material. It's manufactured from a high density cork and rubber blend with a black latex coat applied to the outside to help seal minor flange irregularites and eliminate oil leakage.
Mr Gasket Valve Cover Gasket Set 5877; Ultra-Seal .187 in. for Chrysler 361-440
Mr Gasket Valve Cover Gasket Set 5862; Ultra-Seal 0.187 in. for BBC
Mr Gasket Valve Cover Gasket Set 177; Cork/Rubber Gaskets .187 in. for BBC
Mr Gasket Valve Cover Gasket Set 5863; Ultra-Seal 0.312 in. for BBC
Mr Gasket Valve Cover Gasket Set 5867; Ultra-Seal .187 in. for 87-02 305/350 SBC
Mr Gasket Valve Cover Gasket Set 179; Cork/Rubber Gaskets .312 in. for SBC
