[68 RS Z/28]

I guess the broken stud does explain the low compression - I hadn't thought of it that way, but of course if nothing is getting in then there is nothing to compress so that does make sense. With the broken stud I didn't want to run the engine again and so wasn't able to warm the engine, but I did do a leak down test anyway this evening before starting to really pull things apart. The results were between 9 and 13% on all cylinders. I'm assuming that on a warm engine these numbers might have been lower. No air was detected leaking out from problem areas like adjacent spark plug hole, bubbles in the coolant, etc. Do these numbers sound okay? I then started to pull stuff off the engine and when removing the right exhaust manifold I found a thin line of oil that had been leaking from the back of the valve cover and it looks like some of it had penetrated into the exhaust manifold near the number 8 cylinder. I think this is the cause of the ocassional smoking given that the leak down results didn't show any big problems. So, I think that once I get the studs replaced and put it all back together the problem should be solved. If anyone has any suggestions on other items to check while its apart, I'd be glad to listen. Thanks for the advice.