so i have a 96 gst. i had noticed that the valve cover bolts where loose so i tightened them up. then the next day at work i started blowing a bunch of white smoke out and blowing oil out the oil fill cap. so i went and got a new PVC valve and that seem to have fixed the white smoke problem but it hasn't fixed the oil blowing out of the filler cap. now i have done a compression test and everything is good. no water in the oil. nothing like that. so any ideas on the oil coming out of the filler cap????

 

your oil cap gasket is prolly old and needs to be replaced!! try that