Triumph Pre Unit 500 base gasket 70-2249 1946-1957

This gasket is the ONLY 500 PRE UNIT base gasket that fits and works with NO EFFORT. The pink, green, or blue gaskets made for the pre unit 500 are most likely made by people who never tried to install them. They belong in the trash can... and not on one of the best engines Triumph ever produced. These are aluminum core with a nitrile rubber bonded to both sides. This AFM gasket material has excellent temperature resistance, torque retention, and will not squeeze out as some gaskets made of fiber can. This gasket was designed by using a pristine Triumph T100 close fin cylinder and scanning the base with the sleeves removed. The oil holes were compared with the case, and then a steel rule die was made to stamp it out of the AFM material. It is the most highly engineered and effective Triumph base gasket ever made. No sealant of any type is needed, and due to the high rate of recovery when disassembled, in most cases the gaskets can be reused. This will fit 5T Speed Twin, T100 iron head