F226 parts are widely available, just be carefule when ordering. It would be best to provide engine serial number. You can google Foley Engine. They have tons of flathead Continental parts. You can also try Jerry Moon at Montes Equipement in Chicago. Again, google is your friend.
With regards to "performance" parts, everything is going to be custom unless you want to stop with 0.060" over pistons.
You could bore much bigger, but it will also cost more money. You could install a performance cam grind (I can help). You could also look to stroke. I am sure that 3/4" would fit. The big question is: Is it all worth it? IMHO, that answer is NO. The best running F226 engine (at stock +20% over, mind you) is going to top out at around 75HP. With some mild massaging, you can get a near stock 44 to that for 1/4 of the money.
If you really want to pull a flathead Continental and the pullers in your area aren't that knowledgeable (many aren't), then you should look to purchase a B427 flathead, M330, or M363 Continental to drop in.
Perhaps Jerry at Montes could help you locate one. You will probably have about the same money in purchasing and installing the bigger flathead than working over a F226...
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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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