The 10.5 and 12.5 have been EUI (electronic unit injector) equipped from the get-go, and also have overhead camshafts. The blocks actually look a little similar to late 7.6. It's a pretty small block relative to the displacement, but obviously moving the camshaft to the cylinder head allows for more bore and especially stroke relative to the size of the block. Good engines all the way around. I did have to go through one awhile back that had water pump bearing balls go through the timing gears. Not good. Got it all back together and had an oil leak. When the balls went through it shoved the camshaft up hard enough to crack the front cam bearing bore. So, it got torn down completely and rebuilt with a reman cylinder head.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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