Posted by The tractor vet on May 11, 2014 at 12:37:52 from (75.24.5.173):
In Reply to: C263 to C291 ? posted by JT's RandR on May 11, 2014 at 09:30:08:
To make a C263 into a C291 the block has to be bored . and the special sleeve for this has to be used . I have done a bunch and the results are amazing . But i get carried away on the rebuilds . When i say rebuild i mean rebuild . Line bored (not Honed ) deck is trued up crank is done if needed rods done both ends, head total rebuild and cam rebuild and blue printed with new lifters , rockers reground , Distributor recurved as when you go to 291 the total advance timing needs to be layed back to 19 degree Before TDC at full throttle . The main fuel jet needs to be opened up just a whisker like about .0015 . And if ya really want to gain a few pony's then ya have everything weighed and balanced . Then when you start to put the engine together you hand fit each piston to the hole your going to put it in and give .004 skirt to wall clearance . Now the big thing here if you want it to live a long and happy life then you must FEED it the prime rib of gas and use nothing but 93 octane . Now as the reason to run the low ash oil , if ya don't they will plum eat exhaust valves . My two closest fiends run C291 706 and they get the bag run off of them on a full time working farm . The 706's are the go to tractors when the weather turns cold as they have the power and weight to do what is needed . Will they use gas ??yes so does your pick up pulling a trailer . How much it will use depends on what your doing . I can mow rake twice 28 acres on one tank of gas with a 9 foot haybine on some of the nastiest ground you will ever want to put a tractor on . I farmed for several years with a late model 706 with a C291 and pulled a 710 4x16 plow and a 370 13.5 foot disc and never thought that it used to much gas same as my Massey 300 Combine .
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