I was sitting here wondering if the compression numbers done in a static fashion where bad enough to cause your missing symptom. The return tube from the vacuum pump does not have oil in it either? Common oil burning problem on these earlier engines.


At running or dynamic rpm the effective cylinder compression comparisons may be different. Your oil consumption is very excessive for the lower blocks expected normal condition at that milage as well.


Almost sounds like the overheat was so bad the piston rings may have lost their tempering. Anyways I would be tempted to get a newer 616 engine to get away from your type of injector pump. A little more horsepower as well after about 1981?


I believe you can still find really solid 616 engines still out there. The newer engines with minor modifications go in pretty easy. You just have to be pretty selective in what you choose as a used engine.


Otherwise I would pull the head and have a look at the crosshatching and general bore conditions.There are things here that do not add up properly.


Do not neglect the simple check of backing off each injector line when the engine is missing to locate the cylinder that is not firing properly. I would want things nailed down a little better before deciding on a course of action.