Still learning the whole Chevy thing so I'm coming on here for some help. I have a Chevy 305 in the circle track truck I bought. Main seal is leaking so I know I have to pull it and repair that since its a one piece. But while warming up the engine to check that leak the other day, I noticed a steady light stream of white smoke coming out of both valve cover breathers (drivers side). Ran a compression test today and all eight cylinders were anywhere from 150psi to 160psi. Any ideas what might be causing the smoke? Just not real sure what to check next. Old owner doesn't know anything about cars, just had his builder work on things, so he's of no assistance.
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