ENSURE A LEAK-FREE FIT: valve cover gaskets are the most common leak-repair component. Using materials like the Blue Stripe cork-rubber composite, Permadryplus rigid carrier construction, or molded rubber, Fel-Pro ensures its gaskets compensate for surface irregularities and resists high heat and vacuum.
This is the best v.c. Gaskets money can buy. They are for the guy who wants to do it once. No glue is needed or allowed. They are designed to last and not leak. Can only be used on late 1959 or newer.( holes have to be opposite, not staggered like early 1959 and older.)