These are the valve cover gaskets used for all the valve cover applications with the exception of RA IV and modified valve trains. These gaskets are approximately .140" thick. Your valve cover bolts should be 9/16" in length when using this type of gasket. If they are not the correct valve cover bolts are sold in the shopping cart. Cork gaskets are also avaiable in the shopping cart.These will fit Pontiac from 1955-1977 plus Buick and Oldsmobile.