Help with Head Gasket selection
Yes, they are in order. I noticed a pattern as well. I've checked the deck with a 18" Starrett straight edge and I can't get a .002 feeler under it. They seem flat. There definitely isn't .010 bow in them. I am going to verify that tonight with the cast iron straight edge I use to scrape milling machine and lathe ways flat. I think it is either the middle throws on the crank being a little longer, or longer rods on those cylinders. I'm going to see if I can measure any difference in piston travel on those cylinders that would indicate the crank being the culprit.
I should probably check the rod bearings anyway. I can pull the pistons out, check the bearings, maybe measure or compare the rods to each other. .010 difference should be easy to see. If it all checks out I will button it up and re-torque the rods. I did find out that I have a bigger mix of rods than I thought. Remember, six are copper coated and two are bare. I found out that one of the bare ones is a later 645 part from a post 73 318-360. This thing just keeps getting better and better...:mad: