We find the Remflex exhaust header gaskets to be the absolute best on the market. Our application is header connection to GM Circle Track Crate Engines. There are different Part # for the GM602, 603, and 604. For the GM603 use the gasket for GM LT1 Corvette engine.
Fixed my leak as advertised!! Awesome and highly recommend!! Tried 2 other brand and a waste of money. Will keep an extra set of these for my next motor!!