750257 1 7 8 Opening Use with All S S and Other 1 7 8 48MM Manifold

This S&S Cycle manifold insulator block serves as a thermal barrier between the cylinder heads and the carburettor. By reducing heat transfer, it prevents fuel boiling and vapor lock, ensuring more consistent intake temperatures and improved engine performance. This specific spacer is designed for 1 7/8-inch or 2 1/16-inch bores and features a standard 2 1/2-inch mounting hole pattern, making it compatible with Tillotson, Bendix, and Keihin butterfly-style carburettors. Manufactured from heat-resistant material, the block includes a Viton O-ring for a reliable, leak-free seal. S&S Cycle produces these components to exacting tolerances, providing a simple solution for heat management on air-cooled V-twin engines where intake stability is paramount.