Cylinder ridge an inch down in the cylinder. What gives?
I'm helping a friend of mine with a freshening up of a Dodge 400ci B-Block. After pulling the heads we found something kind of odd. We thought originally that the engine had never been in to, but found out differently when we saw .030 pistons in the bores. All the cylinders looked good except for the #7 cylinder. It appears that the cylinder ridge starts about an inch down in the hole. The ridge on all the cylinders is probably less than .005, but what would cause this problem. I don't think it's a broken ring, the walls look fine and the wear is all the way around the diameter of the cylinder bore. I guess it's possible that who ever rebuilt the engine forgot to put the compression ring on but the engine obviously ran for a while. It seems that a problem like this would have made the engines life rather short.