So I am getting the chero ready for the spring months and want to replace the leaky valve cover gaskets. The valve covers I have on them now are aftermarket aluminum ones. I went to remove them and they are stuck like no other, and I am scared to pry on the valve covers themselves as they are aluminum. I tried to let them warm up to see if the gaskets would expand and become easier to work with but it did nothing. I don't remember what kind of gaskets I put on when I put these new covers on, as in rubber or cork. Anyone have any ideas to try on these? Also I have been having problems with the bolts for the covers becoming loose on their own. I have them tightened to what the spec says to go to. It said to go between 3-5 ft pounds so I put them on at 48 in. pounds. I'm not sure if the bolts are not seating correctly or something. Thanks for any opinions. Hopefully I am just missing something.