So you can take the top half off to adjust the valves while it's running and not have oil run out. Someone told me just to cut the top out of one, just for adjusting the valves.
And I did see the Edelbrock V/Cs "The look of two piece valve-covers without the price" WTF??? WHAT'S THE POINT IN THAT?!? How hard is it to make two piece valve covers anyway?