Ultra-Seal Head 1957-1991 Chevrolet 283-350 Gen I Small Block 4.100 Inch Bore .028 Inch Compressed Thickness Mr GasketMr. Gasket Ultra Seal Head Gaskets are a five layer (graphite core perforated steel outer layers) composite construction. The graphite core has excellent thermoconductivity (transfers heat) away from hot spots in head preventing Gasket burn out. They provide excellent stability, compressibility and high temperature endurance. A high temperature silicone coating ensures sealing of engine fluids. Compatible with cast iron or aluminum heads, they will
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Ultra-Seal Head 1957-1991 Chevrolet 283-350 Gen I Small Block 4.100 Inch Bore .028 Inch Compressed Thickness Mr Gasket