Have been trying to fix 1989 Trooper valve cover leak for 2 years since I bought. I installed new AMC head and have tried different brand valve cover gaskets, with & without RTV. Nothing seems to hold up past 1 month or so. From the last owner's receipts, she paid many times to have this same leak fixed. The valve cover design has no baffle to prevent oil from pooling against the gasket, but otherwise appears OK. Anybody have any luck with fixing this leak once and for-all (at least until I set the valves at every 12K)? Or is this a common occurance with this motor?