Thanks for your input. It sounds as if you have the same configuration as mine. I guess I need to face the very real probability that I didn't need to drill them out - that maybe a little more aggressive pulling on those blocks would have done the trick. We'll have to see if my curiousity about the situation will overcome my inclination to leave well enough alone and move on - sadder but wiser. In any case the car is running very well now and it would seem that this story does have a happy ending. I really appriciate your opinions, and I look forward to picking your brain on other problems. Bob H