Andrew: Most every modern diesel you could fit in there without lengthening frame rails will develop the same hp as the 450 but at 2,000 rpm. It will affect ground drive speeds, however I think that would be livable. The crunch will be 540 PTO, it's going to happen around 1,500 and probably give you less hp than the 450 diesel engine.
Personally if it were me, I'd rebuild the 450 engine. You don't need to be cracking heads on a regular basis. I know guys that have put 10 to 15K hours on those old gas starts and never cracked a head. You've got to start it right and shut it down right. None of this pulling the kill switch the instant the throttle lever hits the idle mark. This diesel was part of the evolution, before it on many farms was the horse and he had to be unharnessed, groomed and fed at the end of each day. Could 5 min idling to allow the 450 diesel time to cool down, be so bad.
If your farming and want one of the modern day Farmall diesels, go out and buy yourself a 656, 666 or 686, basically the same dependable reputation as the M, SM, 400, 450 and 560, plus you get modern day 3 point hitch, much better IPTO, modern day forward mounting operator's platform, much better remote hydraulics and a 6 cylinder diesel up front giving you more horsepower.
As of 2007, no one has built a better 3 point hitch than on 06, 56, 66 or 86 series Farmalls. That is 40 years, and they are not out of date. Your 450 was out of date before it was 10 years old.
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Today's Featured Article - A Lifetime of David Brown - by Samuel Kennedy. I was born in 1950 and reared on my family’s 100 acre farm. It was a fairly typical Northern Ireland farm where the main enterprise was dairying but some pigs, poultry and sheep were also kept. Potatoes were grown for sale and oats were grown to be used for cattle and horse feeding. Up to about 1958 the dairy cows were fed hay with some turnips and after that grass silage was the main winter feed. That same year was the last in which flax was grown on the farm. Flax provided the fibre which w
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