About any standard replacement cams for a M to a 450 made in the last 50 some years are supposed to be the same as what some call a 450 cam. If the 400 cam is in the same condition as whats called a 450 one there's no need to change. About 1/3 of the 450 engines used the same cam as a 400. Then IH decided to put left hand threads on them for the cam nut. Special cam grind could make more power if matched to your needs.
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Today's Featured Article - It Can't Be Done! - A Tractor Story - by Neil Campbell. I'll never forget the time back when I was a boy baling hay on our Farm in Big Rapid, Michigan. The most memorable event that took place was a trip up the steepest incline on the farm pulling an old New-Idea baler with a pony-motor for power and a haywagon. I had just talked my Dad into buying an old John Deere B with 6-speeds ahead and I was real proud of it, except it was a little smaller than the Case tractor that we normally
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