I'm looking for some help from you experienced engine guys.
I had to pull the 408 due to a leaky rear main seal and a couple other leaks. It has been running perfect and I hated to pull it, but I was not going to try to replace the 2 piece rear seal under the truck again.
I have a slight wear spot on all the cylinders which I thought was odd. It's not major, as it has just barely removed the crosshatching.
This is on what I would have thought would be the unloaded side of the cylinder. The pic below shows the piston starting down on the power stroke. I would figure the force against the rod would drive the piston to the left side, but the wear mark is on the right side. There is virtually no marks on the piston.
The other issue I have is the rod bearings. The rod side of the bearing is showing some copper. I have only pull #6 piston so far, but I would imagine they all look like this. I need to get some Plastigage to check the clearance, but I was thinking of just rotating the bearings 180* if the clearance is OK or do you feel there is something wrong here. The bearings are Clevite 77.
The engine has about 6000 miles on it. I run 20W50 Quacker State dino oil. The builder said I should run the 20W50.