Don't quote me on the price, but Murphy's, Extreme, and Baker have all told me around the $800 range for a custom piston set.
At that price, you can bore the block and buy the large head gasket, and not be out much more money than a 281 piston and sleeve kit.
Just make the compression ratio work with the head you have.
A bore anywhere from 4.280" to 4.375" with 10 - 12 for compression, even with the SM gas head should put you anywhere from 65 - 75 hp.
The largest bore and a 450LP head would creap up on 80hp.
Add a cam, and you should be able to do pistons, gaskets, cam job, block bore, and all for $1500 - $2000.
If you are going with the largest bore (4.375"), go with the BEST machine shop you can find. If a bore is off center, the sleeve can break through or seperate from the deck.
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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