My 1992 Previa has a bad head. I had the head gasket done 16 months ago and they had it was discovered that their was a hairline crack in it. The mechanic told me that it could be welded and the van would be fine. I had discussed this with Timsrv and he told he was very weary of this. I decided to let the mechanic do his job since he told me that he too had over 200,000 on his Prev with a welded head. Not taking heed to Tim's thoughts on it (again) has turned out disastrous. Sadly, mine didn't even make 40,000 miles before it started overheating. My new mechanic told me that it was the head and it looked like the head had been taken off before plus it looked like a "Mickey Mouse" job. This time, he wanted to replace the head but with 192K on the odometer, I decided to go with a used JDM engine. Prices have gone up in the last year so now the engine is costing me $625 instead of $400. Now I have to put off buying an All Trac this year because of this. Tim, from now on, I will take your advice 100%. You seem to be the only one who really knows these vans.