Ultra-Seal III, Mr. Gasket's premium intake gasket material, provides the ultimate seal for high performance street, drag race and oval track use. This is a great gasket to use if you like to work on your engine because the coated surface will not stick during disassembly, meaning no tedious scraping required. The high-tensile strength material survives the harshest pressure while conforming to seal any imperfections on sealing surfaces. If you are working on a modified port engine, Ultra-Seal III gaskets can be trimmed for the perfect fit.