hey dude, story is one thing fact is another.Fact 1 soilds are just that, solid Fact 2 hydrolics need oil pressure to pump up, in order to work. The solids will run and continue opening and closeing the valves without oil until they wear out and fry. hydrolics on the other hand will not work without pressure and will not open and close the valves. The post is about a guy worried that 30lbs pressure for a small block might be to low.