Speedmaster™ oil pan stud kits, which include heat-treated studs with rolled threads and special nuts with built-in serrated washer faces, are undoubtedly the best choice for attaching your Speedmaster™ pan. These kits provide easy pan installation and prolonged gasket life, and their special serrated nuts guard against pan loosening during operation. This universal kit includes four 5/16-18 in. and sixteen 1/4-20 in.