Mr. Gasket 222 High Performance Stock Port Intake Gasket Forms an airtight leak proof seal Engineered specifically for Ford 351Ms and 400s with 2.160 inch by 1.530 inch intake ports .062 inch thick and precision die cut for exact fitment and years of trouble free service Ensures optimum torque retention ideal crush resistance and excellent sheer strength sealing with minimal clamp force yet still releasing easily every time Comes complete with block off plates and all necessary seals