yeah i wouldnt flush any acid or any corrosive cleaner through you water system. taking the heads off and cleaning them is not hard at all. if you can take a spark plug out then you can do it yourself. only thing you need is new head gaskets, head cover gaskets and thermostat gaskets. also you will need a torque wrench when putting it back together. you can do it yourself for about 100-150 bucks. a shop will charge 500-800. look on thehulltruth.com and search. there have been a few guys on there who did write ups with pics showing how they did it.
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