QUOTE (RCH @ Oct 8 2009, 12:01 PM)

How difficult is it to replace the head gasket on a Previa?
Why do you think you need a head-gasket? Sometimes it could be a head-gasket and other times it ends up being a cracked head (usually between the valves), or worse case scenario, a cracked engine block. Do a compression test both "wet" and dry as well as hooking up a cooling system pressure tester and pumping it up to 16 pounds. If the van will start, then the coolant pressure gauges needle will drop at the dead cylinder. (if you don't have a compression tester).
I Hope This Helps,
~Stillin~