Like Jim said, a little pitting in a diesel isn't the worst thing in the world. They don't have predetonation issues like a gasser. Another thought is TIG welding up the pits and then machine the welds down. That is what my buddy did to build some hicompression pistons for a 4455 puller. I also agree that those might be some tough pistons to get ahold of.
Here are some pictures of mine and 90% of people said run them. I ended up finding a used motor about 5 hours from me for $150. It also ended up having oversize pistons as well. Now all I need to do is pull the motor and bore out my current sleeves and life is good. I even have another spare motor sitting in the neighbors shed. I guess I should find another 9 series for all my spare parts!
The other thought is you are not too worried about oil consumption since it will only run 15 min at a time BUT you are worried about compression. This would make a rotted out ring area a little iffy.
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Today's Featured Article - Women and Tractors - More Views From the Farmer's Wife - by Teri Burkholder. The top ten reasons why the judges wouldn't let you participate in the stock antique tractor pull: Hey, this is stock! It came with that V8 in it! That "R" on my tires stands for "really old" not radial! Blue gas? We thought it was a pretty color! What wire hooked to my throttle?
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