D. Parker, Parts are basically nonexistant , but there are some ways around that problem. I have several 1000 crawlers , some loaders and some dozers. I also am in the engine rebuild biz , makes hunting parts somewhat easier . As for parts , here goes a list that may confuse
you a bit . For mains use large MM rod bearings, one in each end narrow two for the center main and make oil holes and tang slots as needed . for rods use large case rod brgs , narrow .100 and hone big end of rod .025 to fit case brg. bore and sleeve the liners , use a cat piston pin and pin bushing . for worn ring grooves ,put GI's in the grooves . For cam brgs use 2 cummins v12 in front bore, use 2 F series ( narrowed ) for center ,use 2 G series for rear bore . I did find a fellow on the west coast that
makes rear seals that bolt in . Fel Pro is the only supplier and their set has no rear seal and no manifold gaskets ( kind of a joke to call it a full set ). I have liner o-rings . There are no more proper brgs in the after
market , I got all there were about 10 years ago , PC was the last to have them and those were in a return warehouse in texas . Make sure you go thru the balancer , if the bushings are bad in the oil pump end , it will ruin the oil pump. Then that requires a 6.2 chevy oil pump and a lot of machine work , but boy does it make oil pressure . When you pull the valve train don't loose the little buttons on the end of the rockers , and if they are worn bad I can rebuild them . Casepower is right 403 is a direct bolt in, but when you mount the flywheel housing , you must dial indicate and redowel just like doing a cummins or mack truck. also indicate and shim the front pump mount ( not on D series). Must use case water pump and adapter and crank pulley. Send me an email . george
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