16777-66-S Gasket set cylinder base 3-5/8" big bore. .040" paper

For Big Twin owners running a 3-5/8 inch big bore setup, these James Gaskets cylinder base gaskets are the professional choice for a reliable seal. These .040-inch gaskets are constructed from fiber-reinforced paper with a solid steel core, providing excellent stability and resistance to blowout. They feature a final crush thickness of .031 inches, ensuring proper deck height and compression. This set is designed to fit 1963 to 1984 Big Twin models, excluding Evolution engines, that have been upgraded with big bore cylinders. Sold in a pack of 10, these gaskets are perfect for the shop environment where high-performance Shovelhead or Panhead builds are the standard.