Originally Posted by RickyRoland
my 1997 Ford F250 7.3 # 4 and #6 cylinders are sharing Compresion
It's nice to share things like a beer or two out of the 12 pack, a slice out of the pizza, a blanket with a hottie or even a piece of cheesecake.
Cylinders sharing compression, not so nice. My first guess would be a head gasket. Pretty much the only way to nail down why is to pull the head anyway.