factory rpms

Early tractors were rated at 115 and 135 HP respectively. Later ones were 125 and 145 HP. Rated speeds went from 2400 on early models to 2600 RPM on the later ones.
 
Try external_link under International Harvester, they have some figures for you, how accurate?
1066 126 PTO 2400 rpm after 1973 then 2600 rpm
1466 tested 145 PTO rpm 2400 after 1973 then 2600
 

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