1973 340 issues.

should have checked that before you put it in.....2,6,and 8 are no good.....you can squirt oil in those 3 cylinders and recheck compression.....if it goes up then the rings are shot.....If it stays the same could be valves

It was a running engine I bought from someone in North Scotland in good faith. But it was out of the car it was pulled from so I could not really do much checking. As it ran I was happy just to get it installed when I was doing the 4 Speed swap. Still goes better than my 318 so I fairly happy and knew it was a risk. :)

How much oil can I squirt into the cylinders?