Your best bet is doing the 263 to 291 upgrade . Ya bore the block and install the special sleeves . For a super job on a rebuild ya have the block line bored (not line hoined like a lot of shops do . ) This will make sure that the crank is not binding any at all and running true , That is the first step , next lightly decking the block to make sure that it is true and flat. Next recutting the counter bores so that all the sleeves set at the same height . Now the block is done as far as machine work , Then ya install new cam bearings . Next is rebuilding the rods and checking them for straightness and having both ends done ,NOW if ya want to really get carried away and IMHO the best money ya can spend is Balancing , cheapest Hp. gain you can make . Send the cam out for a rebuild here again well worth the effort . Next is the head like someone else said BUT ya don't need nothing special here as STOCK PARTS ARE MORE THEN good enough . When you go to start putting the engine together ya do NOT just start stuffen pistons in , YOU FIT EACH PISTON TO THE HOLE and you then give each piston to that hole .004 extra clearance . Other area's you have to address are fatting up the carb and changing the curve in the dist. as a 291 does not use as much timing advance as a 263 and is limited to 18 degrees at high idle where as the 263 is 23 degrees . Making sure your heat riser in the manifold is working is another area to be looked at . If you run the low ash oil and the 93 octane fuel it will do everything you will ever need . Ya don't run the 93 then you can expect to learn all about piston insulation . I have done quit a few over the years and we are running two of them wright now . As long as we get the gas we order then we do not have any problems and they run strong and yes at times we do work them harder then we should but ya use what ya have to work with . The ones i have done are vary impressive in performance and are running real close to a good running 301 . And as long as we can get sleeves and pistons they are REBUILDABLE . once a 301 is out to the .060 you either bore and install a repair sleeve and start over or ya scrap it . some say they are hard on gas ?? i do not think so . Take your gas powered pick up and make her work for 10-16 hour in a day and see how much gas ya put thru it . I can mow first cutting hay on 28 acres of some of the nastiest ground you will ever want to put a wheel tractor on pulling a 1219 John Deere Haybine and mow 6-8 hour then rake it sometimes twice and do this on ONE full tank of fuel plus still have more then enough fuel to pull the haybine back to the home farm 8 miles away up and down some pretty steep hills . Did the same farm with the 806 Diesel and used about the same amount of fuel oh but wait the 806 has a bigger tank . First cutting at times here can be a bit on the heavy side and work the snot out of even the 806 .The nice thing about a gasser IS that it will START when you need a tractor in this weather wright now .
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Today's Featured Article - A Lifetime of Farm Machinery - by Joe Michaels. I am a mechanical engineer by profession, specializing in powerplant work. I worked as a machinist and engine erector, with time spent overseas. I have always had a love for machinery, and an appreciation for farming and farm machinery. I was born and raised in Brooklyn, New York. Not a place one would associate with farms or farm machinery. I credit my parents for instilling a lot of good values, a respect for learning, a knowledge of various skills and a little knowledge of farming in me, amo
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