if your o-rings arent bad, just put a little silicone on them, for the rocker box base gasket you can get a harley twin cam gasket (they are like 12 bucks a peice), but you have to drill a 3/8hole for the vent system, just match up the gasket n punch a small hole in it then drill, if you dont then the crankcase will pressure up and then you have problems, I did this to mine and its working fine, no leaks, no worries.