Review on FEL-PRO VS 50588 R Valve Cover Gasket Set: Advanced Sealing for Optimal Performance by Leon Yulharmanto

Major upgrade to original silicone gaskets instead of rubber. Everything fits perfectly. Spark plug tube seals are designed as a crankshaft seal with a round spring that extends around the top of the tubes and seals the oil. I had to use a pry bar to remove the old pipe gaskets because they were encrusted and hard as rock. The check valve cover is one of the greatest tests of patience. I highly recommend that you put a few dabs of RTV in the rear valve cover gasket groove to prevent the gasket from falling off while attempting to install the check valve cover. Replacing these gaskets also allows you to replace the spark plugs (get a Denso Iridium), intake manifold upper gasket, throttle body gasket, PCV valve and clean the throttle body. The engine will thank you later, and you will thank yourself.