I'm sure that running the car w/o the valve cover installed will cause a huge vaccuum leak but the car should run. Running w/o the cover will also cause a huge oily mess unless something is rigged to catch the oil. I built what amounted to a valve cover minus the top so I could see if one or more of the rocker arm orifices was not dropping oil. I found that all the rocker arms were in new condition except the one that was not dripping oil (which had excessive wear due to lack of lubrication) and did not see the need to buy all new rocker arms. Thus,the time taken to observe the cam oiling was worthwhile. Although I decided to remove the rocker arms, I found upon removal that I probably could have removed the minor obstruction with a small wire but would have had a rocker arm with excessive error (probably from the month I drove the car with the rocker noise) I considered replacing the cam; however, it looked OK and did not have any damage to the hardened surfaces except for some minor discoloration on the lobe that did not get lubrication. BTW, I had a new cam from a Volvo engine that I considered installing but decided against it because the lobes did mike quite as high a lift as my original cam. While this may be obvious, be sure you have the cam in the right positions when adjusting. Rob Grady's help was very useful thru this process. Woody p.s. on another subject: I've had Rob's door cylinders on my car since 1999 and they still work fine. Yahoo! Mail Stay connected, organized, and protected. Take the tour: http://tour.mail.yahoo.com/mailtour.html 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/