i have a 1990 3/4 ton dodge with a 12valve thats completely stock. there is excessive white smoke that pours outa the ccv tube and dipstick tube. it never did this until the truck got stuck in the mud and got a little hot. ive checked the vaccum lines and the main line going to the firewall has enough pressure to hold the line tight to your finger. i was wondering if the headgasket could be a problem to the truck only has 162k miles. any info is greatly appreciated thanks.