You are absolutely right, messing with the heads on the PRV is no simple task. You can get away with a very small amount of milling on the heads. If the heads are really badly warped and you have to mill a lot of materiel off you would have to either use a spacer or fit multiple gaskets in to make up the difference. Neither is a good alternative but hey, the motor got overheated really bad to warp the heads! When a motor gets overheated that bad the heads are not the only thing to worry about. You cooked all the seals so everything may leak, like the seals on the liners. The oil got cooked so it may clog up the smaller passages. Some of the tips I offer may not be the "best" course of action but when you are faced with a motor that got cooked you can try to patch it up and maybe be successful or replace it. Most of us would at least try to get the motor going again. If you do try to get it going you have to check the oil pressure and do a compression test. Change the oil and filter, and watch for leaks. If the motor wasn't really overcooked it should be salvageable. I have seen motors where the wiring over the top of it was just melted like spagettii, that's how hot it got. (Not a Delorean). Needless to say but in such a case very little can be saved out of such a mess. This is just one reason that if you buy a car and the motor doesn't run or there is anti-freeze in the oil you figure the motor is toast. Just buying a set of heads to throw onto a cooked motor may not work either if the rest of the insides are melted. David Teitelbaum vin 10757 > > > From what i've read on some volvo forums about PRV's, you do NOT want > to have any amount of the head surface removed in any circumstance. > From what i've come across in my research, it causes timing chain > problems as even the slightest change in the distance of the cams > from the crankshaft will push the chain tensioners to the limits of > their ability to keep proper tension on the chain.. You also have to > To address comments privately to the moderating team, please address: moderators@xxxxxxxxxxx For more info on the list, tech articles, cars for sale see www.dmcnews.com To search the archives or view files, log in at http://groups.yahoo.com/group/dmcnews Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/dmcnews/ <*> To unsubscribe from this group, send an email to: dmcnews-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/