EST, MON to FRI. Engine > Gaskets and Sealing Systems > Engine Gasket Set. Premium valve stem seals incl. 100 YEARS & COUNTING Our story is an American story; one that began in a tiny Chicago warehouse in 1918 and continues to this day. Our goal has been the same-manufacturing high-quality gaskets that install easily and provide a lasting leak-free seal. As the industry leader, we respond to new challenges with innovative materials, new technologies and a relentless focus on designing sealing solutions for the real-world conditions technicians face in the repair environment. With more than 100 years of expertise, we’ve earned our reputation as The Gaskets Professionals Trust?