what do you mean squeeze it through the covers? The only thing I could think of is maybe squeeze something along the seam where the valve cover bolts to the head. I don't know how well that would work if at all and it would only be very temporary if it did work. I'd just change valve cover gaskets if it's leaking very bad. You gotta pull the upper intake to change the drivers side one If you're gonna do it yourself and have questions, post up. If you're gonna pay someone to do it, well, do that. To answer your question, I don't really think there's a way slow the leak or stop it without changing the gaskets. Sucks doesn't it?