[92EscrtPmp]

Running Midgrade always helped on any of my cars when they started to knock. Now, about the valve seat dropping. The only thing that the mechanic I grew up with could think of is the Lifter on the #4 Cylinder is put under a heavy load, and the springs breaking causing it to rattle loose til it finally drops. now, finding the heavy load that caused it is a different matter. Maybe you got something with the MAF sensor, or the clogged radiator. But I can tell you that the radiator was clogged on mine when the head warped, but the valve seat never droped on mine. Then again, every time we replaced the Valve cover gasket, we made sure all the lifters were Torqued right(2or 3 times). That is something Us scort owners are just gonna have to keep a eye on til we can come together and find the root of the problem.