That's right! For the first time ever, reusable valve cover gaskets are now available for the 400-430-455 big block Buick engines. These are THE BEST valve cover gaskets EVER offered for our engines. Constructed from 3/16" thick nitrile rubber molded around a steel spine with torque limiters at each bolt hole that prevent over-tightening which can crush or split cork gaskets and cause leaks. The days of using old outdated cork valve cover gaskets that leak and tear are over!! These will ensure a perfect seal every time for years to come. Perfect for those who dislike cork or rubber gaskets that weep oil, or racers who have to remove the valve covers often.