I am a farmer but I also own a tree and crane service and we used to just pile up and burn or let rot all the junk logs we bring home. But we found a couple of sawmills not too far away in a Amish community that will buy ANY logs for pallets and blocking. I never in my life thought that someone would buy elm, box elder, locust, hackberry, or any other junk wood! What used to be a waste is now a good deal. We haul a couple loads a week to them and while they do not pay a lot (24 cents a board foot), it is a nice extra check each week. The load in the photo was 2992 board feet but I have had on as much as 4100 feet on a load with some good straight 40 inch diameter logs. The more you load that old Mack, the better it drives and pulls. I started the Mack yesterday and it ran without any knock I could hear, but it vibrates like it is missing on one cylinder. I did a temperature check on the exhaust manifold and the exhaust for the #1 cylinder never warmed up like the other five did. I pulled the oil pan and there are not any large chunks of metal but there are some small flakes like bearing wear. We turned the engine over and there is compression coming into the bottom of the engine from the #1 cylinder. I took off the valve cover and everything there checked out okay. I think a ring broke on the #1 cylinder and got on top of the piston. This morning I am going to pull the bearings on the #1 cylinder and see what damage I find. I think I am going to pull the engine and replace it with a used 237 I found. I just wonder if it will bolt in place. I called a Mack dealer and he said it would as long as it does not have an aluminum front cover on the engine. This one does not so I hope it fits.