I did a compression check today on the front 4 cylinders (ran out of time and light) and ended with problems (see Vehicle Help post about Oil pump for BB) but thats for tomorrow. Anyway the cylinders ranged from about 125 to 135. All plugs out, engine warm, cranking speed could have been faster but OK I think. I added oil to one cylinder and the numbers went up by 5, but it my have just been the cranking time on that one. Sooooo, this is a 400, 1977, maybe (maybe) 86,000 miles. What do you think.