Another thought is, if chevy uses the same seals then why doesn all of their motors smoke on start up?
Types of seals: The seal on the left is the stock o-ring seal.(IH/GM) The seal in the middle is the umbrella seal.(Ford/me) The seal on the right is the positive lock (PC) style seal. These should only be used with the silicon bronze valve guides. They will stop all oil lubrication to the guides. There are numerous different umbrella seals available. I use the standard straight side seals. Not the tapered side or the heavy duty HD seals-they have a thicker rubber at the top and may bind on the springs at full lift. VALVE SPRINGS This is why I removed the rockers. I had a miss on 1 cylinder that I could not figure out. I had spark. Swapped plug…plug wire…. I had fuel. I could not find a vacuum leak. The compression test showed 150psi!! Both valves opening and closing!! But the cylinder would not fire!! So all obvious sources of a miss or dead cylinder had been checked. So I started thinking about the obscure…
