actually i think i may have a blown head gasket. nice replaced a leaky radiator (it was toast) and when i got her all filled up i noticed billowing white plumes from the tail pipe. also got a geyser shooting out of the little vent hole in my coolant reservoir tank. smells like burning propylene glycol... i think mr. murphy caught up w/me very quickly. so it looks like maybe the head's gotta come off sooner than i had hoped. anyone done this recently? any tips?