Dan, I would fall into the "otherwise" category, but since you allowed for those responses.... If you don't get smoke at startup, and don't have other evidence of trouble, drive it. If your oil pressure is tolerable, and doesn't drop significantly after it's well warmed up, I suggest waiting until you are ready to do a complete rebuild, or until your engine demands it. If you do only the heads, the likely improved compression may force the rebuild sooner than if you leave the engine alone. If oil pressure drops when it's warm, and you are using a heavy oil already, maybe the rebuild is sooner than you plan. Without loss of oil pressure, if it runs fairly smoothly, and isn't making ugly noises, continue to pay close attention, and enjoy it. Michael _______________________________________________ Hello everyone (& Dave): I have excessive oil usage on my '67 Imperial engine. Not much of a surprise with 150K+, and sitting for a decade. 1 quart/150 miles at 70 mph, & 1 quart/300 miles at 45ish avg. mph around town. I know the correct answer is to do a complete rebuild. Can't quite pop for that right now, as there are too many other priorities for my next $3000. Compression check months ago was OK, no blue smoke at cold start up (even if sitting for days), no blue smoke at hard acceleration, or after idle - just no blue smoke at all. Idles and drives quite well, gets about 11 mpg. Pulled the plugs yesterday after 3000 miles, and they were nicely tanned/greyed, clean everywhere except wet oil on the threads. Dave had mentioned earlier that big block Mopars have a tendency to need valve seals. If that is what's indicated by the above evidence, I could probably find the resources to pull the heads. Any expert (or otherwise) theories and thoughts would be most welcomed. Dan Richardson 300L Family Heirloom ----------------- http://www.imperialclub.com ----------------- This message was sent to you by the Imperial Mailing List. Please reply to mailing-list@xxxxxxxxxxxxxxxx and your response will be shared with everyone. Private messages (and attachments) for the Administrators should be sent to iml.webmonster@xxxxxxxxx To UN-SUBSCRIBE, go to http://imperialclub.com/unsubscribe.htm